Write a function calctriarea that will calculate and return the area of a triangle. Pass the base and the height to the function as input arguments.

Here are examples of using the function you must code:

>> tri_area = calctriarea(5, 3)

tri_area = 7.5

>> help calctriarea

Calculates the area of a triangle

The first input argument is the base; the second input argument is the height