If you draw one diagonal across a parallelogram, it will split it into two congruent triangles. A rectangle is a parallelogram, with all four angles equal to 90°.
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The area of a parallelogram is twice that of the two triangles that are formed by the line transecting it. (Sort of like finding out how many cows you have by counting eyes and dividing by two.)
Yes all rectangles are parallelogram but all parallelogram cannot be rectangles.
You can get 2 triangles by cutting a parallelogram in half
2 triangles and 3 rectangles
Some parallelograms are rectangles; all rectangles are parallelograms.