Question

which quadrilateral has equal diagonals
select one:
○ a. trapezoid
○ b. rhombus
○ c. parallelogram
○ d. rectangle

a square is ________ a parallelogram
select one:
○ a. always
○ b. never
○ c. sometimes

Explanation:

For the first question: A trapezoid only has one pair of parallel sides and its diagonals are not always equal; a rhombus has equal sides but its diagonals are perpendicular, not equal; a general parallelogram has bisecting diagonals but they are not equal; a rectangle's diagonals are both equal and bisect each other.
For the second question: A square has two pairs of parallel sides and meets all the criteria of a parallelogram (opposite sides parallel and equal, opposite angles equal, diagonals bisect each other), so it is always a parallelogram.

Answer:

1. d. rectangle
2. a. always