Area of a Triangle

Write a function that takes the base and height of a triangle and return its area.

Example

triArea(3, 2) ➞ 3
triArea(5, 4) ➞ 10
triArea(7, 4) ➞ 14
triArea(10, 10) ➞ 50
triArea(12, 11) ➞ 66
triArea(0, 60) ➞ 0