What do a quadrilateral and a pentagon have in common?
Answer: A quadrilateral and a pentagon have in common are that they both are closed polygons and the sum of their exterior angles is 360°.
Both quadrilateral and pentagon are two-dimensional closed shapes.
A quadrilateral is a closed polygon that is obtained by joining four points among which any three points are non-collinear. Hence it is a 4-sided polygon.
The pentagon is a 5-sided polygon formed by joining 5 vertices and no three vertices are collinear.
Also, we know that the sum of exterior angles of any polygon is 360°.