[27] Triangle

import math

print("Enter 3 side lengths.")
x = float(input("Side one: "))
y = float(input("Side two: "))
z = float(input("Side three: "))

if x + y > z and x + z > y and y + z > x:
    half_perimeter = (x + y + z) / 2
    area = math.sqrt(half_perimeter * (half_perimeter - x) * (half_perimeter - z) * (half_perimeter - y))
    print(f"The three sides can make a triangle, and it's area is {area}.")
else:
    print("It's not possible to make a triangle out of the given sides.")