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

Tutors Answer Your Questions about Geometry proofs (FREE)

Question 343793: solve the equations and state a reason for each step.
p-1=6
2r-7=9
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Question 343833: i need help on proofs in geometry
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Question 343785: If PR is the diameter of the circle, explain how you
would convince someone that quadrilateral PQRS has at
least two right angles.
Please help me I am struggiling with this geometry:(
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Question 344245: Given: B is the midpoint of --
MD
Prove: MD= 2(MB)
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Question 344940: a ^ ( b ^ c)
prove c
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Question 345254: given: m<1=m<2, m<3=m<4
Prove: ray YS is perpendicular to line XZ
prove in two column form (statement, reason)
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Question 345320: If Mary goes shopping, then she will buy a new dress.
What is the hypothesis of the conditional statement.
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Question 345533: Given: Angle BAD ~ Angle CAD Underneath the ~ sign are equal marks
AD congruent BC , over the AD & BC is a line
Prove: Triangle ABC is Isosceles using the two column proof method.

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Question 345593: 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; Segment CD is the altitude to base of segment AB
TO PROVE:
Segment CD bisects angle ACB
Can someone PLEASE help me with this 2 column proof?
I have to put the statements and reasons....I am having so much trouble.

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Question 346119: Given: l is parallel to m
Prove: the measurement of angle 4 + measurement of angle 5= 180 degrees
Show the statements and reason
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Question 346269: If the statement is M is the midpoint of line segment AB what would be the reasoning?
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Question 347324: Given XA=ZC Prove AC=ZX
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Question 347468: The triangle inequality states: PQ + QR > PR
Prove that the equality holds if and only if the point Q lies on the line segment PR when we use the usual Euclidean distance formula.
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Question 348048: 10th Grade Geometry Proof
Greetings...
Here is the problem:
Given: Line segment.SZ ≌ Line segment.ST
Line segment.XY ≌ Line segment.VW
Y is the midpoint of Line segment.ZX
V is the midpoint of Line segment.TW
Prove: Line segment.SX ≌ Line segment.SW
The figure is here: http://i676.photobucket.com/albums/vv124/Frostcaster/proof11.png
I am now in a chapter titled "Multiplication and Division properties"
My grade level is 10th.
-------
I tried to solve it...but the outcome does not seems right.
If my proof is all messed up, please don't bother to fix it, start a new one.
------
Statements | Reasons
1/SZ ≌ ST | 1/Given
2/XY ≌ VW | 2/Given
3/Y is the midpoint of ZX | 3/Given
4/V is the midpoint of TW | 4/Given
5/Y bisects ZX | 5/If a point is the midpoint of a segment, then it bisects the
segment.
6/V bisects TW | 6/If a point is the midpoint of a segment, then it bisects the
segment.
7/ZY ≌ YX | 7/If a point bisects a segment into two segments, then the two
segments are congruent.
8/TV ≌ VW | 8/If a point bisects a segment into two segments, then the two
segments are congruent.
9/SX ≌ SW | 9/If segments are added to congruent segments, then the sums
are congruent.
--------
Thanks!
Click here to see answer by jim_thompson5910(28476)

Question 348187: I have been trying to help my fourth grade grandson he needs to make a quadrangle with only one right angle. draw in the right angle symbol and how do we know it is a right angle please help
Click here to see answer by Alan3354(30965)

Question 348492: if two parallel lines are cut by a transversal, then the alternate exterior angles are congruent
Click here to see answer by stanbon(57223)

Question 348877: Greetings,
Here is a 10th grade Geometry Proof. I tried it but failed...didn't even came up with one statement that's make sense.
The figure and the given statements are here:
http://i676.photobucket.com/albums/vv124/Frostcaster/proof13.png
Thanks.
Click here to see answer by Fombitz(13828)

Question 349109: Given: m < ABC = m Prove: m<2=M<3
Click here to see answer by Fombitz(13828)

Question 348221: Given: angle one is congruent to angle two
Prove: angle two is congruent to angle four
Click here to see answer by nyc_function(2733)

Question 348224: given: angle three is congruent to angle two.
prove: angle one is congruent to angle four.
Thank you!
Click here to see answer by nyc_function(2733)

Question 348227: Given: angle one is congruent to angle five.
Prove: angle two is congruent to angle six.

Thank you!
Click here to see answer by nyc_function(2733)

Question 348228: Given: measure of angle six equals the measure of angle seven.
Prove: angle five is congruent to angle eight.

Thank you!
Click here to see answer by nyc_function(2733)

Question 348230: Given: angle two is congruent to angle six; angle four is congruent to angle three.
Prove: angle two is congruent to angle four.

Thank you!
Click here to see answer by nyc_function(2733)

Question 349316: what is x+1/2+3x-5=90
Click here to see answer by rfer(12645)

Question 349509: The question I have is Solve each equation. Write a justification for each step. 1/2n=3/4 and 1/5(a + 10)= -3
Click here to see answer by Fombitz(13828)

Question 349876: The circle whose equation is x2+y2=2, and the line y=x+4 do not intersect.
Click here to see answer by Fombitz(13828)

Question 350026: Hello. I would like to know how to write a proof for this problem:
Given: AC=AB, AC=4x+1, AB=6x-13
Prove: x=7
Click here to see answer by mananth(12270)

Question 349870: Given: 4x+6/2=9
Prove: x=3
Click here to see answer by chibisan(131)

Question 350679: Prove the conjecture below by writing a variable statement and using algebra.
Conjecture: The sum of five consecutive integers is always
divisible by five.
x + (x + 1) + (x + 2) + (x + 3) + (x + 4) = ?

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Question 351062: What is the differnce between a postulate and theorem?
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Question 351100: Which of the following is a counterexample of the conjecture below?
Conjecture: The product of two positive numbers is always
greater than either number.
A 2,2 B 1/2,2 C 3,10 D 2,-1

Click here to see answer by Fombitz(13828)

Question 351315: Here is my Paragraph proof.I need to turn it it into a two-column proof.Can any one help me?
If CD is an altitude to AB, then CD must be perpendicular to AB because of the definition of an altitude. Since a ray perpendicular to a segment creates two right angles, angles ADC and BDC must both be right angles and therefore are equal in measure. Angles CAD and CBD must be equal in measure because the triangle is isosceles and AB is the base. Segment CD is equal in measure to segment CD since things are always equal to themselves. Hence triangle CAD is congruent to triangle CBD by AAS. Hence angle ACD is equal in measure to angle BCD by CPCT. Therefore segment CD bisects angle C by definition of an angle bisector.
Click here to see answer by solver91311(16868)

Question 351437: if you have ac=ab+bc what did you do to get to ac=5+6
Click here to see answer by Alan3354(30965)

Question 351537: i have no idea how too solve two column proofs.
but i am not sure how to show you the geometric shape i need help with, what should i do?
Click here to see answer by mananth(12270)

Question 351532: Adam says bob lies
bob says charlie lies
charlie says Adam and bob both lie
a) if Adam telling the truth, then bob is lying. what can you conclude about char lie's statement ?
b) assume Adam is telling the truth .explain how this leads to a contradiction
c) who is telling the truth ? who is lying ?
Click here to see answer by Jk22(389)

Question 351552: a second type of proof in geometry is a proof by __________.or indirect proof.
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Question 351770: I need help trying to solve this proof question, If AB = BC, then AC = 2BC
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Question 352099: Tell whether statement is always ,sometimes,or never true
1 A triangle is convex
2 A decagon is regular
3 A regular polygon is equiangular
4 A circular is a polygon
5 a polygon is a plane figure
6 A concave polygon is regular

Click here to see answer by stanbon(57223)

Question 351928: I need help with multi step proofs
Click here to see answer by Fombitz(13828)

Question 351888: Which number is Irrational?
a) 27 b) p c) 1/2 d)5.333...
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Question 352021: Prove ray AB is a subset of line AB.
I was thinking I needed to show x as a point on ray AB and then if x is a point on ray AB it would also be a point on ray BA. I just am stuck on how to pull it all together and prove that a ray AB is a subset of the line AB. I know it is true, just stuck.
Click here to see answer by Fombitz(13828)

Question 352342: I have a test over geometric proofs tomorrow and im totally lost! can you give me some examples on how to do them?
Click here to see answer by Edwin McCravy(8880)

Question 352657: Can you solve this proof for me please?
Given:AB=BC
Prove:1/2 AC=BC
Click here to see answer by Fombitz(13828)

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