Answer:
Plug in the Pythagorean Theorem and you get 5[tex]\sqrt{3}[/tex]
Step-by-step explanation:
We know that 5 is half of ten, so square those two.
a+25=100
a=75
[tex]\sqrt{75}[/tex]=5[tex]\sqrt{3}[/tex]
The answer is A, 5[tex]\sqrt{3}[/tex].
Hope this helps :)
