J L N

MK

Given: KL || MN; KL MN

L is the midpoint of JN

Prove: JK || LM

PROOF #1

J L N

MKPROOF #1 – ANSWER KEY

Given: KL || MN; KL MN

L is the midpoint of JN

Prove: JK || LM

Statements Reasons

PROOF #2

Given: LF || WH; HY LY

Prove: ΔWHY ΔFLY

W

H

Y

F

L

PROOF #2 – ANSWER KEY

Statements Reasons

W

H

Y

F

L

Given: LF || WH; HY LY

Prove: ΔWHY ΔFLY

PROOF #3

Given: X and Y are right angles;

WZ bisects XZY

Prove: ΔWXZ ΔWYZ

X

Z

W

Y

PROOF #3 – ANSWER KEY

Statements Reasons

X

Z

W

Y

Given: X and Y are right angles;

WZ bisects XZY

Prove: ΔWXZ ΔWYZ

Given: B and C are right angles;

AB DC

Prove: ΔABD ΔDCA

PROOF #4

A D

B C

PROOF #4 – ANSWER KEY

Statements Reasons

Given: B and C are right angles;

AB DC

Prove: ΔABD ΔDCA A D

B C