True
False
A quadrilateral is a parallelogram if and only if its diagonals bisect each other (this should be in any geometry book)
Theorem A: A quadrilateral is a parallelogram if its opposite sides are congruent. Theorem B: A quadrilateral is a parallelogram if a pair of opposite sides is parallel and congruent. Theorem C: A quadrilateral is a parallelogram if its diagonals bisect each other. Theorem D: A quadrilateral is a parallelogram if both pairs of opposite angles are congruent.
False. Bisecting diagonals is sufficient to guarantee a parallelogram, but the diagonals will only be perpendicular if the sides of the parallelogram are equal.
No.
True
true
The missing word is "bisect".
always
False
false
no
no
its rhombus.rectangle,square
Parallelogram and rhombus.
A quadrilateral is a parallelogram if and only if its diagonals bisect each other (this should be in any geometry book)
A parallelogram.