G.CO.C.11: Prove theorems about parallelograms. Theorems include: opposite sides are congruent, opposite angles are congruent, the diagonals of a parallelogram bisect each other, and conversely, rectangles are parallelograms with congruent diagonals.

Prove theorems about parallelograms. Theorems include: opposite sides are congruent, opposite angles are congruent, the diagonals of a parallelogram bisect each other, and conversely, rectangles are parallelograms with congruent diagonals.

Example Problems
Triangle ABC has the following vertices:
A

B

C

Is triangle ABC a
right triangle?
Triangle ABC has the following vertices:
A

B

C

Is triangle ABC a
right triangle?
Triangle ABC has the following vertices:
A(
)
B(
)
C(
)
Is triangle ABC a
right triangle?
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