$6.$ Geometry Calculator

Write a program that displays the following menu:

Geometry Calculator

$1.$ Calculate the Area of a Circle

$2.$ Calculate the Area of a Rectangle

$3.$ Calculate the Area of a Triangle

Enter your choice $(1-3)$:

If the user enters $1,$ the program should ask for the circle's radius and display its area.

Use the following formula: area $=r^2$

Use $3\mathrm{.}14159$ for $$ and the radius of the circle for $r.$

If the user enters $2,$ the program should ask for the length and width of the rectangle and then display the rectangle's area. Use the following formula: area $=$ length $*$ width

If the user enters $3,$ the program should ask for the length of the triangle's base and height, then display its area. Use the following formula: area $=$ base $*$ height $*\mathrm{.}5$

Submission: submit c file