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140 Answered Questions for the topic Proofs

Proofs

02/04/15

Speed, velocity and acceleration proof

Show that, if an object is moving on a straight line, then its speed is increasing when its velocity v and itsacceleration a have the same sign, and its speed is decreasing when v and a have... more
Proofs

01/19/15

Given: ABCD AD=BC and AB=DC Prove: ABCD is a parallelogram

Given: ABCD, AD≅BC and AB≅DC  Prove: ABCD is a parallelogram    
Proofs Geometry

11/24/14

proof with extra step

I have a test tomorrow and I still don't know how to write a proof. I know the basis (first step is given) but from there its basically Portuguese to me ! I know CPCTC but I don't know the steps in... more

10/26/14

"If 2x-7=4 then 5.5=x" How do you put that in a 2 column proof?

 I can start it out but after the first one im lost. I know the statement for the first one is 2x-7=4, then 5.5=x, and I know the first reason is given but after that im totally confused, and cant... more
Proofs

10/10/14

whats the proof to this?

Given:  ∠5 and ∠6 are complementary; ∠7 and ∠8 are complementary; ∠5 ≅ ∠7   Prove:  ∠6 ≅ ∠8
Proofs

08/27/14

Let (A,?A) and (B,?B) be partially ordered sets. Define C = A × B and define the relation ? on C by (a,b) ? (a',b') ?? (a ?A a')?(b ?B b').

Let (A,?A) and (B,?B) be partially ordered sets. Define C = A × B and define the relation ? on C by (a,b) ? (a',b') ?? (a ?A a')?(b ?B b'). (a) Prove that ?' is a partial order on C. (b) Prove that... more

08/21/14

how to prove a congruent angle

givens: <1=x+7 <2=2x-3 <ABC=x*2 <D=5x-4 show that <ABC is congruent to <D
Proofs

02/25/14

write a proof in two column form given: ?1??2 prove: AD/AB=AE/AC Proof:

i need to ger an statements and reasons
Proofs

12/19/13

Can you solve my proof

Given: angle 1 is the complement of angle 2; angle 3 is the complement of angle 4; line AB is parallel to line CD Prove: triangle ADB is congruent tI triangle CBD

10/21/13

how to write a two column proof, proving corollary 4.4

learning about two column proofs and triangles
Proofs

10/15/13

Write a two column proof for the following

If PQ is congruent to QS and QS is congruent to ST, then PQ equals ST.
Proofs Geometry

03/12/13

Why do we need proofs in Geometry?

I am doing geometry and we are studying proofs. Why do we need proofs in geometry? What purpose do they serve in geometry?
Proofs Geometry

01/09/13

how do you do two-Column proofs well?

how do you do two-Column proofs well?

11/26/12

Prove that Z x Z is countable

This is a proof or a disproof with a salvage.
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