Question

I have two 2D shapes, with a total of seven sides and seven vertices. I can join
them together to form a new shape that has three sides and three vertices.

Answer 1

Respuesta:

In mathematics or geometry, a heptagon is a polygon with seven sides, seven angles, and seven vertices.

Explicación paso a paso:

En matemáticas o en geometría, un heptágono es un polígono con siete lados, siete ángulos y siete vértices.