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

Tutors Answer Your Questions about Geometry proofs (FREE)

Question 942912: In a word processing document or on a separate piece of paper, use the guide to construct a two column proof proving AC > EF given BC = EF.
Click here to see answer by richard1234(7193)

Question 943817: write the first statement of the indirect proof of the given statement:

"If AB is not perpendicular to BC then angle ABC is not a right angle"
Is the answer : angle ABC is a right angle?
Click here to see answer by richard1234(7193)

Question 945268: my homework says to solve each equation show all your steps and write a justification for each step. I'm working on algebraic proofs.
1) 1/5(a+10)=-3 I tried I don't know if it's right
a+2=-15
subtract 2
a=17 ?
Click here to see answer by Alan3354(69443)

Question 948565: Find the slope of the line parallel to the line passing through each pair of points. Then state the slope of the line perpendicular to the line passing through each pair of points
(9,-3) 2. (-8,-12) (4,-1) 3. (5,-2) (9,-6)

Click here to see answer by Fombitz(32388)

Question 948770: Given: parallelogram XYZW; angle X=80 degrees
Prove: parallelogram XYZW is not a rectangle
Click here to see answer by Fombitz(32388)

Question 949186: Given:
AB = CD
BC = DA
Prove:
B = D
Which of the following triangle congruence theorems would be used in this proof?
Click here to see answer by Theo(13342)

Question 950815: Does m∟A = m∟L make sense or does it need the congruent symbol.
Click here to see answer by EdenWolf(517)

Question 952394: How do I prove that the triangles formed by one diagonal of a kite are congruent? I was only given that quadrilateral ABCD is a kite and segment AC is a diagonal
Click here to see answer by Theo(13342)

Question 952550: I need a five step proof (statement and reasoning) to:
Given: 3y+5=x and x=y+1
Prove: x= -1 & y=-2
I'm working with definitions, theorems, and postulates. Thank you so much!
Click here to see answer by josgarithmetic(39799)

Question 953632: If a triangle has two equal angles, than the sides opposite to these angles are also equal.
Click here to see answer by Alan3354(69443)

Question 953648: When we add 2n even integers, the answer is even, n>0.
Click here to see answer by Alan3354(69443)

Question 954311: Hi can someone help me please.
Question : tell whether the transformation appears to be a translation. Explain.
Here is the link to the picture copy and paste the link please
http://prntscr.com/6ewyog
Click here to see answer by Fombitz(32388)

Question 955326: Given: O is the center of the circle; Prove: RO bisects NRP
Click here to see answer by Alan3354(69443)

Question 955362: AEC,DEB and AB are straight lines.the straights lines DA and CBF are parallel.angle ABF=90�,angle CEB=55�and angle ABE=25�.find angle ADE and find angle EAB ,explaining with reason

Click here to see answer by macston(5194)

Question 955644: I do not understand proofs at all and I currently have a 60 in my geometry class because I can't do them. Please help me solve this proof. Thank you!
Prove: Segment BD and segment AE are diameters of circle C
Segment BD is perpendicular to segment AE
Prove: the measure of arc AB is congruent to the measure of arc ED
Click here to see answer by josgarithmetic(39799)

Question 956008: the diagonals of an isosceles trapezoid are equal prove
Click here to see answer by MathLover1(20855)

Question 956696: If line �a� is a perpendicular bisector of �segment MN�, then which of the following statements is not true?
Click here to see answer by Alan3354(69443)

Question 957161: The major arc its 100 degrees and the minor arc is 50 degrees. What is the value of x? Explain your reasoning?
Click here to see answer by Alan3354(69443)

Question 957800: Prove (by contradiction) that any perpendicular height of a scalene triangle cannot bisect any angle of the triangle.
Click here to see answer by jsmallt9(3759)

Question 958981: Given : Angle A and Angle B are supplementary; Angle A = 4(Angle B)
Prove : Angle D =36 degrees
Click here to see answer by Fombitz(32388)

Question 960598: Given: Right Triangle ABC
Prove: (sin A)^2 + (sin B)^2 = 1
Click here to see answer by Alan3354(69443)

Question 961124: Prove that FH=HJ . Go to this link by copying it and pasting it into your search bar to see the whole problem with the shape, given, and what there is to prove.
COPY THIS LINK
file:///Users/ckillian55/Desktop/Screen%20Shot%202015-04-06%20at%2012.10.14%20PM.png
Click here to see answer by EdenWolf(517)

Question 963604: What is the reason for the third step in this proof?
Given: a || b, and both lines are cut by transversal t.
Prove: 2 7

Click here to see answer by Alan3354(69443)

Question 965883: Use techniques of Analytic Geomatry to prove that the slope of one diagonal of a rectangle is the negative of the slope of another diagonal
Click here to see answer by Fombitz(32388)

Question 965887: Prove that a diagonal of a rhombus bisects each vertex angle through which it passes
Given: ABCD is a rhombus, AC is a diagonal
Statement: line AB in congruent to line BC
Angle 1 is congruent to angle 3
Line BC is II AC, AB is II to CD
<2 in congruent <3, <1 is congruent to <4
<1 is congruent to <2, <3 is congruent to <4
AC bisects I need help with the reasons for my statement, thank you
Click here to see answer by Edwin McCravy(20081)

Question 965939: Graph the equation for values up to and including 100 miles.
Click here to see answer by Alan3354(69443)

Question 965978: Using a geometric proof, show that in a regular polygon ABCDEF
,
Click here to see answer by Edwin McCravy(20081)

Question 965976: Using a geometric proof, show that, in a regular polygon ABCDEF,
Click here to see answer by Edwin McCravy(20081)

Question 966259: Given: Quad ABCD is a trapezoid
Prove: A(Triangle ACD) = A(Triangle BCD)
Statements:

Reasons:
Click here to see answer by ikleyn(53763)

Question 967866: Find the minimum volume of a rectangular container, without a lid, with the external surface area 6912�.
Please use the "Theorem of Maximization"
Click here to see answer by Alan3354(69443)

Question 968916: What's ac=bc
Click here to see answer by MathLover1(20855)

Question 969073: Given: rhombus ABCD, E is the midpoint of DF
PROVE: AD is congruent to BF
Click here to see answer by Edwin McCravy(20081)

Question 969188: In parallelogram ABCD, AE is perpendicular to BC and AF is perpendicular to CD. Prove that triangle ABE is similar to triangle ADF.
Click here to see answer by Edwin McCravy(20081)

Question 970425: Given line EF, <1=<2
Prove: <3=<4
Click here to see answer by Alan3354(69443)

Question 970443: If line nm bisects line GH then angle 3 and angle 4 are complementary
Click here to see answer by Alan3354(69443)

Question 972033: Prove that if one pair of opposite sides of a quadrilateral is both congruent and parallel, the quadrilateral is a parallelogram.
Given: Line BC is parallel to line DA, Line BC is congruent to line DA.
Prove: ABCD is a parallelogram.
ABCD looks like a parallelogram with line BC and AD opposite to each other. It also shows that BC AD are parallel and congruent.
PLEASE SHOW EACH STEP FOR ME. I WOULD GREATLY APPRECIATE IT :)
When showing the answer, if possible, please have the answer look like this:
Statements............... Reasons
1...............................1.
2...............................2.
3...............................3.
4...............................4.
etc............................etc.
Click here to see answer by KMST(5347)

Question 972310: Select the correct reason for the numbered statement.
prove if a/b = a/b and c=0 , Then a=b
Statement 2
(Points : 1)
Division Property of Equality
Multiplication Property of Equality
Inverse Property of Multiplication
Identity Property of Multiplication

Click here to see answer by josgarithmetic(39799)

Question 973512: So I took a state test today and I'm not sure if I messed up or if I will get partial credit for my work, but here goes.
We had to prove a quadrilateral was a rectangle and I showed that all the adjacent slopes were negative reciprocal giving it all right angles.
IS THAT ENOUGH?
Did I have to show it was a parallelogram first?
Click here to see answer by KMST(5347)

Question 973723: Can someone please help me? I've having a really hard time trying to figure out this problem. Also please show your work. Thank you!!
Find the value of x.
Given: RS~ST, m angle STR = 3x - 48, m angle STU = 9x
Click here to see answer by rothauserc(4718)

Question 974067: The diagram below, not drawn to scale, EFGH is a rectangle. The point D on HG is such that ED=DG= 12 cm and GDF=43� Calculate to one decimal place.
A) the length of GF
B) the legth of HD
C) the size of angle HDE

diagram can be found http://www.cimt.plymouth.ac.uk/mepjamaica/unit34/StudentText.pdf on pg 25

Click here to see answer by Alan3354(69443)

Question 974341: Hello! My sister is in great need of help with geometric proofs (and I really want to help):
Given: Triangle WXY inscribed in Circle and XY is the diameter
Area of Circle/Area of Triangle WXY = 2 Pi
Find m (XY2)
It must be written under the Givens and the Proofs.
Please help :) Thank you!
Click here to see answer by Boreal(15235)

Question 974502: Daniel sees mile marker 141 when gets onto the highway and mile marker 67 when he exits the highway. How far did Daniel travel on the highway?

Click here to see answer by Alan3354(69443)

Question 974704: Complete the table by providing justification for each step of the proof.
Conjecture: If 4(x2 � 2) = 28, then x is 3 or �3.
Click here to see answer by Boreal(15235)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825