Question

A square has a diagonal length 13m. What is the side length of the square?

Answer 1

have you covered the 45-45-90 rule?

Answer 2

a^2 + b^2 = c^2
a^2 + b^2 = 13^2

a = b

Answer 3

keep in mind that both sides are equal, thus a = b
so \(\bf c^2 = a^2 + b^2 \implies c^2 = a^2 + a^2 \implies c^2 = 2a^2\)

so you have the diagonal, you know what "c" is, then solve for "a"