ACT Preparation / Unit 13 ACT 1216 short lesson, about 20 seconds
Parallelograms
Captions available
The idea
A parallelogram has both pairs of opposite sides parallel. Its opposite sides and opposite angles are equal, consecutive angles are supplementary, and its diagonals bisect each other.
In practice
A parallelogram with one 65° angle has angles of 65°, 115°, 65° and 115°.
Where people slip
The diagonals bisect each other but are not equal in general.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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