···667788def triangleArea(a: float, b: float, c: float) -> float:
99- """Use herons formula: `sqrt(sp(sp-a)(sp-b)(sp-c))` to calculate the area of a triangle using it's side lengths."""
99+ """Use herons formula: `sp = (a+b+c)/2` & `sqrt(sp(sp-a)(sp-b)(sp-c))` to calculate the area of a triangle using it's side lengths."""
1010 semiperimeter = 0.5 * (a + b + c)
1111 return sqrt(
1212 semiperimeter * (semiperimeter - a) * (semiperimeter - b) * (semiperimeter - c)