not very sure how to solve this
Hi Marisa;
a^{2}+b^{2}=c^{2}
a^{2}+b^{2}=9^{2}
Because this is a square, a=b...
2a^{2}=9^{2}
2a^{2}=81
Let's divide both sides by 2...
(2a^{2})/2=81/2
a^{2}=40.5
square-root both sides...
√a^{2}=√40.5
a=6.36