Which of the following statements is false?

Question

A. A rhombus is a regular polygon.
B. The diagonals of a rhombus are perpendicular and bisect each other.
C. A rhombus is a quadrilateral.
D. A quadrilateral is a polygon with four angles.

Answer 1

A regular polygon must be equilateral (all of its sides are the same length) and equiangular (all of its angles are the same measure). A rhombus is equilateral: all of its sides are of the same length. But it is not equiangular (unless it's a square).

Therefore, (A) is false.