Write a c++ program that displays the following menu:Geometry Calculator1.Calculate the Area of a Circle2.Calculate the Area of a Rectangle3.Calculate the Area of a Triangle4.QuitEnter your choice (1-4):If the user enters 1, the program should ask for the radius of a circle and display its area. Use the following formula:Use 3.14159 for and the radius of the circle for r. If the user enters 2, the program should ask for the length and width of a rectangle and then display the rectangle's area. Use the following formula:area=length*widthIf the user enters 3 the program should ask for the length of a triangle's base and its height, and then display its area. Use the following formula:area=base*height*0.5If the user enters 4, the program should end.Last Modified: 09/14/17area=r2 Input validation: Display an error message if the user enters a number outside the range of 1 through 4when selecting an item for the menu. Do not accept negative values for the circle's radius, the rectangle's length or width, the triangle's base or height