Question

1. what is the side length of the square? 64 mm²

Explanation:

Step1: Recall area formula

The area formula for a square is $A = s^{2}$, where $A$ is the area and $s$ is the side - length.

Step2: Substitute given area

We know $A = 64$ mm², so $s^{2}=64$.

Step3: Solve for side - length

Taking the square root of both sides, $\sqrt{s^{2}}=\sqrt{64}$, and since the side - length of a square cannot be negative, $s = 8$ mm.

Answer:

$8$ mm