using C++

1. Write three different functions to compute the Area of three different geometrical figures: (a) Circle (with input parameter radius) (b) Rectangle (with two input parameters width and length) and (c) Triangle (with three input parameters: a, b and c where a, b and c are three sides of the triangle.

Declare and define these three functions, and call them suitably from main, and display the values of the areas of each three geometrical figures.

The formula for areas are as below:

Circle:

Area = (radius)²

Where define pi as a constant and its value is 3.1416 (approximate value)

Rectangle:

Area = length * width

Triangle:

Area =

Where, s = (a + b + c)/2