Question

What is the name of a polygon that has twice as many sides as a quadrilateral?

Answer 1

Octagon

Explanation:

Quadrilateral is a polygon with 4 sides. So, we need a name for a polygon with 8 sides.
Mathematician frequently use Latin or Greek languages to name objects. In this case the name octagon is derived from Latin octo ("eight") and shortened Latin word for an "angle".