Question

A square postage stamp has area 1280 mm. About how long is each​ side?

Answer 1

Each side is 35.78 mm

Explanation:

A square would have 4 equal sides. Since area of a square is x^2, where x is one side, we can write:

x^2 = 1280

x = 35.78 mm

Each side is 35.78 mm