Question

If all four angles of a quadrilateral are right angles, then the quadrilateral is a square. Which of the following is a counterexample to this assertion?
A.a rectangle that is not a square
B.a trapezoid
C.a parallelogram that is not a rectangle
D.a rhombus that is not a square

Answer 1

Answer is choice A.

We can draw out a rectangle that is stretched out and not a square. This rectangle will have all four angles equal to 90 degrees (right angles).