Exercise 4 The lateral surface area of a right-circular cone (a right cone with a base that is a circle) can be calculated by the function: f:h, r f(h, r); f(h, r) = ar 1p +h where h is the height of the cone and r is the radius of the circular base. Step 1: Use a calculator to determine the area of a right circular cone for various positive values of r and h. These will be your test cases for Step 5. Step 2: Create a new editor window and save it. Use lab3ex4.py as the file name. Step 3: Type this function header: def area_of_cone (height, radius): This function will return the lateral surface area of a right circular cone with the specified height and radius. Complete the function definition. For the value of t, use variable pi from the math module. Python's math module also has a function that calculates square roots. To find out about this function, use Python's help facility. In the shell, type: >>> import math >>> help(math.sart) Step 4: Save the code, then click Run. Correct any syntax errors. Step 5: Use the shell to test your function. Use the test cases you prepared in Step 1. For each test, is the actual result (the value returned by the function) equal to the expected result (the value you calculated in Step 1)