Answer:
A
Step-by-step explanation:
Using the pythagorean theorem, [tex]a^{2} +b^{2} =c^{2}[/tex]
we plug the numbers in; [tex]3^{2} + 6^{2} =c^{2}[/tex]
9+36=c^2
45=c^2
sqr root of 45 is [tex]\sqrt{45}[/tex]
next find the positive perfect sqr root of 45 which will be 9.
9 goes into 45 5 times so it will be [tex]\sqrt{9x5}[/tex]
Sqr root of 9 is 3 so it will be [tex]3 \sqrt{5}[/tex]
