HELP ASAP!!!! EXPLAIN

Answer:
C
Step-by-step explanation:
Pythagorean theorem states that
a^2+b^2=c^2
so in order to get one of the sides you need to determine the measurements of the right triangle
the bottom of the triangle :4
the side of the triangle : 7
add now just feel in the letters with these numbers
4^2+7^2= sqrt(65)
therefore ur answer is C