Question

Find the side length S of the square.

When your answering, please explain too. Like probably the formula
thanks

Answer 1

Answer:

21

Step-by-step explanation:

A = s^2

$s = \sqrt{A}$

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

Answer 2

21 because 21×21 =441
length × width= length × length = length2 = 441 square cm.

Thus length = √441 = 21 cm.