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

Tutors Answer Your Questions about Geometry proofs (FREE)

Question 552699: why are ad and bc perpendicular to ab and dc?
Click here to see answer by Alan3354(31538)

Question 552703: so n=90 why
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Question 554090: How do you know when to put the letters like SAS AAS ASA And SSS? Thank you.
Click here to see answer by richard1234(5390)

Question 554048: This is from the geometry regents August 2011, number 38.
Given: Triangle ABC with vertices A(-6,-2), B(2,8), and C(6,-2)
Line AB has midpoint D, Line BC has midpoint E, and Line AC has midpoint F.
Prove: ADEF is a parallelogram.
ADEF is not a rhombus.
Click here to see answer by KMST(1936)

Question 554559: help me figure out proofs involving triangles?
Given: m∠3 = m∠7
m∠2 = 60°
m∠6 = 115°
m∠5 = ?
I've figured out that m∠4 = 10, but from there how would i figure out what m∠5 equals? Here's a pic of the triangle below

http://assets.openstudy.com/updates/attachments/4f0b3b0be4b014c09e64bd2b-avieira-1326136086980-page69b.gif
Thank you so much in advance!
Click here to see answer by Edwin McCravy(8999)

Question 554901: I need help with this proof. I can't get past the given.
Given: Triangle RST is an obtuse traingle.
Prove: Triangle RST Does not have a right angle.
Click here to see answer by richard1234(5390)

Question 554898: Could you help me figure out how to solve a problem that only gives me a Prove and no Given.
Prove: Z = X + Y
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Question 556480: How do you set up an indirect proof & solve it?
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Question 555730: Write the proof of the following theorem: if a quadrilateral is a kite,
then its diagonals are perpendicular.
Click here to see answer by Edwin McCravy(8999)

Question 556879: If C is the midpoint of AE and
Click here to see answer by JBarnum(2044)

Question 556952: Given: Angle 1 is equal to Angle 2 and Angle 5 is equal to Angle 6
Prove: Line EC bisects Angle BED
Click here to see answer by JBarnum(2044)

Question 557352: could you please help me on this problem.
the difference between two complimentary angles is 32. find the larger angle.
ive started
c-2=32
don't know if equation is right
Click here to see answer by bluemockingjay7(41)

Question 557341: please help me on this problem
The difference between two supplementary angles is 10. find the acute angle.
i really don't know if this is right but,
s-s=10
(180-x) - (180-x) =10
have no idea if the equation is right, but i know the awnser is supposed to be 85
Click here to see answer by Theo(3504)

Question 557354: could you please help me with this problem.
four times the complement of an angle less the supplemant of an angle is 27. find the angle
ive started
4c-s=27
don't know if equation is right or if the awnser to it would be right
Click here to see answer by ankor@dixie-net.com(15747)

Question 557719: Given that angle A is congruent to angle D and angle D is congruent to angle E write a paragraph proof to show that angle A is congruent to angle E.
Click here to see answer by richard1234(5390)

Question 558425: How do I simplify 7/x=5/10?
Click here to see answer by Alan3354(31538)

Question 558496: Can someone please help me solve this proof ?

Click here to see answer by richard1234(5390)

Question 560481: What is the proof for this?
AF+FE=DE+FE
Click here to see answer by solver91311(17077)

Question 560680: given: AB is parallel to CB, AB is parallel to CD
prove:angle 1 is congruent to angle 2
Click here to see answer by jim_thompson5910(28717)

Question 561645: I don't know how to approach this proof.
For all numbers a, b,c,d is an element of real numbers.
B,d do not equal zero
if a/b = c/d
then ad=bc
Why mudr the restrictions on b and d exist.
should the same apply to b and d.
Click here to see answer by mananth(12270)

Question 562152: Make a two column proof to prove that x=-1 if 5(3-2x)=28+3x
Click here to see answer by richard1234(5390)

Question 562942: How do I proof a parallelogram? I am very confused in proofs. Is there a list I can see on the vocabularies to proof? The question is, Given (square)ABCD
prove: AC and BD bisect each other at E.

Click here to see answer by mananth(12270)

Question 563179: 2y=8x-2
Click here to see answer by stanbon(57984)

Question 563210: GIVEN: ANGLE 1 IS CONGRUENT TO ANGLE 3,ANGLE 4 IS SUPPLEMENTARY TO ANGLE 1, AND ANGLE 2 IS SUPPLEMENTARY TO ANGLE 3 PROVE: ANGLE 4 IS CONGRUENT TO ANGLE 2
Click here to see answer by solver91311(17077)

Question 563454: a) Prove the diagonals of a cyclic quadrilateral bisect each other
b) prove if the diagonals of a quadrilateral bisect each other then the quadrilateral is cyclic.
I know the opposite sides of the quadrilateral are equal and the SAS theorem proves the triangles made by the diagonals are equal I just dont know how to write the proofs
Click here to see answer by richard1234(5390)

Question 564532: what is the proof for the collary to theorem 4.7 (converse of the base angles theorem?)
Click here to see answer by Edwin McCravy(8999)

Question 565710: O is the centre of the circumcircle of 4ABC, and AP is the
bisector of 6 BAC. Prove that OP is perpendicular to BC
Click here to see answer by Edwin McCravy(8999)

Question 565708: Two circles meet at points P and Q, and diameters P A and P B
are drawn. Show that the line AB goes through the point Q. (Probably it is easier to
think of drawing the lines AQ and QB and then showing that they are actually the
same line.)
Click here to see answer by richard1234(5390)

Question 565968: HOW CAN I FILL IN THIS BLANK SPACE:_________ __________ ___________:if B is between A andC,then AB+BC=AC
if AB+BC=AC,then B is between A and C
Click here to see answer by KMST(1936)

Question 566348: What is the area of a sector of a circle with a central angle of measure 120° and whose diameter is 5 cm? Leave your answer in terms of π.

Click here to see answer by ankor@dixie-net.com(15747)

Question 567156: How would you solve this? I'm in ninth grade in Geometry 1 Honors: "Find the sum of the first 80 odd integers. Make your own term and value chart. Label the top row, 'number of odd integers' and the bottom 'Sum'.
Click here to see answer by richard1234(5390)

Question 567088: Proof the given is angel one and angel two are right angels prove that angel one is congruent
To angel two in no less than four steps
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Question 567032: how can you write an indirect proof that two obtuse angles cannot form a linear pair?
Click here to see answer by richard1234(5390)

Question 568387: Prove that if in a cyclic quadrilateral, one pair of opposite angles is congruent, then the other pair of opposite sides is parallel
Click here to see answer by richard1234(5390)

Question 568819: I need to solve a proof for triangle ABC and DEC trying to prove C is the midpoint of AD. I am given that BC is equal to EC and angle A is equal to angle D
Click here to see answer by AnlytcPhil(1278)

Question 569247: How do you prove a triangle is ASA?

Click here to see answer by jim_thompson5910(28717)

Question 569596: What are the steps of justifying problems:
1) 4x+2=2(x+3)
2) 3x+3=2(x-3)
3) 4x+6=2(3x-4)
4) 5x+5-3(x-7)
5) 4x+6=2(3x-5)
Thank you for your help.
Click here to see answer by Alan3354(31538)

Question 569917: Write the inverse of the following statement:
If angle A is acute, then its measure is less than 90 degrees
A- If angle A is not acute, then its measure is not less than 90 degrees.
B- If angle A is not acute, then its measure is 90 degrees.
C-If angle A is acute, then its measure is not 90 degrees.
D- If angle A is not acute, then its measure is more than 90 degrees.
Click here to see answer by nyc_function(2733)

Question 570537: given a||b and c||d prove angle 1 is supplementary
Click here to see answer by richard1234(5390)

Question 572012: given -angle 1 is congruent with angle 2, angle 5 is congruent with angle 6. prove -angle b is congruent with angle c

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Question 573999: write a corrdinate proof to show that the three segments joining the midpoints of the sides of an isosceles triangle form another isosceles triangle
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Question 574390: how to solve the pythagorean theorem with the geometric men formulas
Click here to see answer by Alan3354(31538)

Question 574706: Mid points of square forms a square
Click here to see answer by solver91311(17077)

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