Find the side length s of the square. when your answering, explain too. like probably the formula

21

Step-by-step explanation:

A = s^2

You need to find the square root of the area which is the square root of 441.

What number do you multiply by itself and get 441?

Try 15: 15^2 = 15 * 15 = 225     too low

Try 18: 18^2 = 18 * 18 = 324    still too low

Try 20: 20^2 = 20 * 20 = 400    still low but getting closer

Try 21: 21^2 = 21 * 21 = 441   this is it

s = 21 cm

step-by-step :

493 would be the correct answer

step-by-step explanation: