To answer this question you must use Pythagorean theorem
a and b are the legs (the sides that form a perpendicular/right angle)
c is the hypotenuse (the side opposite the right angle)
In this case...
a = 5
b = 14
c = unknown
^^^Plug these numbers into the theorem
solve for c
25 + 196 = c²
221 = c²
c = √221
c ≈ 14.7
Hope this helped!
~Just a girl in love with Shawn Mendes