Questions on Geometry: Proofs in Geometry answered by real tutors!

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Geometry: Proofs in Geometry

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Question 156246This question is from textbook

: I have a couple of questions, please reply ASAP!
1. Find the angles formed by the clock @
a. 4:45
~My answer= I do not know how to do it, please show me the EXACT WAYS AND STEPS!
b. 4:35
~My answer = 77.5 or 72.5, please show how to do...
c. 11:20
~My answer is 140 degrees
I do NOT KNOW HOW TO SOLVE THESE KINDS OF PROBLEMS SO PLEASE BE SPECIFIC IN HELPING ME! I WANT TO KNOW THE TECHNIQUE!
I AM IN HONORS GEOMETRY- and I am an 8th graderThis question is from textbook

Click here to see answer by ankor@dixie-net.com(6691)

Question 157353: I am very confused about proofs (two column, to be exact). I am in 9th grade Geometry. We are writing proofs using theorems, postulates, and definitions. My question is, how do you know what to write for each step? How do you even know what the next step is?
example:
Statement
RT=5, RS=5, I have to prove that line segment RS is congruent to line segment TS
How on earth do I do this?
Click here to see answer by Fombitz(2113)

Question 157770This question is from textbook Geometry
: i don't understant this question, can you help me out please?This question is from textbook Geometry

Click here to see answer by Alan3354(6059)

Question 157832This question is from textbook Geometry

: G-----H--------J----K
(x+10)- (8) -(2x-4)
Given: Line GH is congruent to line JK, GH= x+10, HJ=8, JK= 2x-4
Find: GJ
I know what the given is for the problem, and I know how to find x, I'm just not sure what I should write on my assignment for all the steps to write this proof in order. Will you please help me solve this geometry proof?This question is from textbook Geometry

Click here to see answer by edjones(3292)

Question 158010: Given: ∠1 and ∠2 are complementary.
∠3 and ∠4 are complementary.
∠1 ≅ ∠3
Prove Theorem 4-6 - if two angles are complements of congruent angles, then they are congruent - by proving ∠2 ≅ ∠4.
Click here to see answer by integral13(8)

Question 158256: Prove 1 + 2^n < 3^n for n >=2
Click here to see answer by checkley77(7035)

Question 158604This question is from textbook geometry

: okay are there any steps to solving a proof? i understand that you first write down the given information, but what do you do next? i dont know where to begin after the given reason. Please if you can help me at all it would be greatly appreciated.This question is from textbook geometry

Click here to see answer by vleith(1977)

Question 158954: Write out the first eight rows of Pascal's triangle.What are the next 2 rows?

1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1
Click here to see answer by Fombitz(2113)

Question 159047: Given: Parallelogram ABCD with Segment AB extended to E. Segment DFE intersects BC at F. Prove: AE/CD = AD/CF

Thanks!
Click here to see answer by gonzo(654)

Question 158835: I need a step by step walkthrough of any proof, and I need it quickly. Someone please help me.
Click here to see answer by Alan3354(6059)

Question 159161: a + b =1 a^-1 + b^-1 = 1 prove a = b and a^-1 = b^-1
I have that
a = b / (b-1)
b = 1-a
plugging in b to a
I get a = (1-a)/a
set those equal
(1-a)/a = b/(b-1)
can't solve any further
Click here to see answer by jim_thompson5910(13787)

Question 159157: please help me with this proof.
given: m m<1=m<4
prove: m<2=m<3
Click here to see answer by Alan3354(6059)

Question 158961: wiil you give me a quck to the point way of solving proofs within a couple minutes, because the teacher goes all around the world and I'm confused. i would like to know a straight to the point answer. I don't know how to do proofs! Thanks in advance!!!
Click here to see answer by Alan3354(6059)

Question 159105This question is from textbook Elementary Geometry for College Students
: Write a formal proof of the corollary.
The opposite angles of a parallelogram are congruent.This question is from textbook Elementary Geometry for College Students

Click here to see answer by midwood_trail(310)

Question 158956: What other interesting patterns can you find in Pascal's triangle?
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1

Click here to see answer by Alan3354(6059)

Question 159347: given: l parallel to m and l perpendicular to n
prove:m perpendicular to n
Click here to see answer by gonzo(654)

Question 159405: please really need help with this problem dont understand it.my teacher said that this can be applied to a right triangle but still dont understand it
given:line ab perpendicular to line bc and d is between A and c
prove: angle abd is complementary to angle cbd
Click here to see answer by edjones(3292)

Question 159413: PROVE:
If an isosceles triangle has an altitude from the vertex to the base, then the altitude bisects the vertex angle.
GIVEN: triangle ABC is isosceles; line CD is the altitude to base of line AB
TO PROVE: line CD bisects angle ACB
Problem says that I have to come up with a plan of the proof as well.
HEEELP!!
TIA, Joanne
Click here to see answer by vleith(1977)

Question 159445: someone please help i need help with an step by step process like right now thank you
given: L PERPENDICULAR TO M AND N PERPENDICULAR TO M
PROVE: L PARALLEL TO N
Click here to see answer by gonzo(654)

Question 159491: i need to prove that angle 1 and angle 2 are complementary given that ray FG is perpendicular to ray FH.
Click here to see answer by jojo14344(1483)

Question 159549: Line AB is congruent to line CD, Line AB is parellel to line CD; prove that triangal ABD id congruent to triangle CDB
Help im so confused on what postulates and theorems i would use to prove this
Click here to see answer by gonzo(654)

Question 159896: In a Proof, can a property be used more than once? i.e.:
DG=GF Symmetric Property
GF=EG Symmetric Property
Click here to see answer by jim_thompson5910(13787)

Question 160069: how do i solve this two column proof?
2(3x-8) = 2/3x + 16
Click here to see answer by midwood_trail(310)

Question 160088: plaease help me solve this equation

Click here to see answer by 983469(5)

Question 160096: The measure of the supplement of an angle is 7 times the measure of the complement of the angle. Find the measure of the complement.
Click here to see answer by Alan3354(6059)

Question 160235: ._____._________._____.
A B C D
Statements Reasons
AC=BD GIVEN
AC=AB+BC Def. of Betweenness
BD= BC+CD Def. of Betweenness
AB+BC=BC+CD SUBSTITUTION PROPERTY
BC=BC REFLEXIVE PROPERTY
AB=CD TRANSITIVE PROPERTY

Click here to see answer by midwood_trail(310)

Question 160265: What is the inverse of the conditional " If Deanne eats the last cookie, then Leon will buy more."
Click here to see answer by HyperBrain(694)

Question 160104: prove two statements below are equivalent.
If two line cut by transversal, the interior angles on one side of the transversal add to less than 180, then two lines will meet on that side of the transversal.
given a line and point not on the line, there exist a unique line through the point that is parallel to the given line.

I can prove them separately but I do not know how o make a connection between the two.
Click here to see answer by gonzo(654)

Question 160135: can you write me a two column proof for the polygon exterior angle-sum theorem? Im using a pentagon. thank-you!
Click here to see answer by gonzo(654)

Question 160862: ISBN 0- 13- 062560- 4
Given: X is the midpoint of line AG and of line NR
Prove: triangle ANX is congruent to triangle GRX
Click here to see answer by gonzo(654)

Question 161433: If a+bc=d, then which expression describes c?
A: d - a + b
B: a + b + c
C: (d-a) divided by b
D: (a+d) divided by b

Click here to see answer by checkley77(7035)

Question 161435: Points R, J, S, G are collinear. If RJ=SG and RJ, JS, and SG are integaers, what value is NOT possible for RG if JS= 15?
A: 18
B: 21
C: 25
D: 17

._____.__________._____.

the order of the points are R, J, S, G
Click here to see answer by gonzo(654)

Question 161393: I have absolutly NO idea how to do proofs. We just started them today so they are basic 2 section proofs. Are there any basics I should learn before I attempt these?
Click here to see answer by checkley77(7035)

Question 161595: I have a worksheet and no book and am lost. Please help.
It states: Use the Law of Syllogism to determine a conclusion from statements (1) and (2).
(1) ALL SQUARES ARE RHOMBUSES.
(2) THE DIAGONALS OF A RHOMBUS ARE PERPENDICULAR.
I must show my work. Please help me.
Thanks
Click here to see answer by ilana(236)

Question 161692: Can you tell me how to work a proof? I don't understand them at all. Mostly I don't understand how you know what the next step is going to be. So, I need help with these very much. Can you show me an example and explain it as you go along? I would really appreciate this.
Thank you.
Click here to see answer by ilana(236)

Question 161720: show that the quadrilateral formed by joining the mid-points of the sides of a square is also a square.
Click here to see answer by MathLover1(1183)

Question 162186: please help me solve the given: maesure angle ABC+ mesure angle CBD=90, masure angle ABC=3x-5, and measure angle CBD=x+1 over 2; and the prove: x=27?
ISBN 0-07-822880-8
Click here to see answer by vleith(1977)

Question 162220This question is from textbook Roads to Geometry
: Please assist me on this proof, I am really not sure where to begin.
If angle measures are restricted to values between 0 degrees and 180 degrees, is the interior of every angle a convex set? Explain. If as Birkhoff did, we allow angle measures to have values between 0 degrees and 360 degrees, is the interior of every angle a convex set? Explain.This question is from textbook Roads to Geometry

Click here to see answer by stanbon(26259)

Question 162224: Given two angles that form a linear pair. Prove that thier bisectors are perpendicular.
please give me the statements and reasons. and please keep it as simple as possible. thank you
Click here to see answer by stanbon(26259)

Question 162509This question is from textbook Geometry
: Yeah. i need help. I dont understand proofs one bit. I am so confused. HELP! And i am in Geometry HONORS>This question is from textbook Geometry

Click here to see answer by vleith(1977)

Question 162525: What congruence test can be used to prove that two triangles are congruent?
I have no clue. Please help.
Thanks

Click here to see answer by vleith(1977)

Question 162701This question is from textbook Geometry for enjoyment and challenge

: Given: angle AFE is congruent to angle DEF
ray FC bisects angle AFE
ray EB bisects angle DEF
Prove: angle one is congruent to angle twoThis question is from textbook Geometry for enjoyment and challenge

Click here to see answer by gonzo(654)

Question 162873: I'm not sure where to start with this proof i'll show you what I have so far but i am not so sure it is correct. There is also a picture/diagram that goes along with the proof, i will do my best to try and explain it.
Given: Segment AC is perpendicular to segment BC; Angle 3 is complementary to angle 1
Prove: Angle 3 is congruent to Angle 2
Diagram: Scalene triangle separated by a vertical segment CD, with verticies labled A (bottom left corner) C (top corner) B (bottom right corner), the segnment CD forms two right angles angle CDA and angle CDB. There are also numbers measuring three angles in the triangle number 3 being the measure of angle CAD, number 1 being the measure of andgle ACD and number 2 being the measure of angle DCB, all three angles are acute. Sorry i am not sure how much help that describtion is i wish i could draw a picture but im not sure how. I know there are about 8-10 steps and so far i have this:
statements reasons
angle 3 is complementary to angle 1 : Given
the measure of angle 3 + the
measure of angle 1 = 90 : Definition of Complementary?
AC is perpendicular to BC : Given
Angle ACB is a right angle : ?
thats all i have so far and im not sure whats right and what isnt, i hope i explained everything well enough...thank you so much for your time
Click here to see answer by elima(1433)

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