Write a description of how a diagram can you solve 2×40

Draw 40 boxes, and in a separate section draw another 40 boxes.
(If you have the time :) )

A diagram can help you by just draw 80 boxes.

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .