Which of these figures is not a quadrilateral?
A) A square
B) A pentagon (Correct Answer)
C) A trapezoid
D) A parallelogram
Explanation:
A quadrilateral is a polygon with exactly 4 sides. Squares, parallelograms, and trapezoids have four sides. A pentagon has 5 sides, meaning it is not a quadrilateral.
Related Common Core State Standard: Geometry: 3.G.1
