Get the 3rd side of right angled triangle from 2 sidesΒΆ

Get the third side of right angled triangle from two given sides.
def pythagoras(opposite_side,adjacent_side,hypotenuse):

    if opposite_side == str("x"):
        return ("Opposite = " + str(((hypotenuse**2) - (adjacent_side**2))**0.5))

    elif adjacent_side == str("x"):
        return ("Adjacent = " + str(((hypotenuse**2) - (opposite_side**2))**0.5))

    elif hypotenuse == str("x"):
        return ("Hypotenuse = " + str(((opposite_side**2) + (adjacent_side**2))**0.5))

    else:
        return "You know the answer!"

print(pythagoras(3, 4, 'x'))
print(pythagoras(3, 'x', 5))
print(pythagoras('x', 4, 5))
print(pythagoras(3, 4, 5))

Output:

Hypotenuse = 5.0
Adjacent = 4.0
Opposite = 3.0
You know the answer!