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,rf(h,r);f(h,r)=rr2+h2 where h is the height of the cone and r is the radius of the circular base. Step 1: Below the comment, \# Exercise 4, type this function header: def area_of_cone(height: float, radius: float) float: This function will return the lateral surface area of a right circular cone with the specified positive height and radius. Step 2: Use the function design recipe presented in the textbook and lectures to complete the function definition. You've been provided with the function header, but must write a complete docstring and the function body. When preparing your docstring examples, use a calculator to determine the area of a right circular cone for various positive values of r and h. For the value of , 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.sqrt) Step 3: Save the code, then click Run. Correct any syntax errors. Step 4: Use the shell and your docstring examples to test area_of_cone