import math
def hypotenuse_length(leg_a, leg_b):
"""Find the length of a right triangle's hypotenuse
:param leg_a: length of one leg of triangle
:param leg_b: length of other leg of triangle
:return: length of hypotenuse
>>> hypotenuse_length(3, 4)
5
"""
return math.sqrt(leg_a**2 + leg_b**2)