How to Calculating the area of a circle using Python:- The area of the circle is the number of square units inside the circle, can be calculated using the radius and diameter. The formula for evaluating the area of a circle is Area of circle using radius=     Pi*r*r     ( r is the radius of the circle) Area of the circle using diameter=    1/4*Pi*d*d   ( d is the diameter of the circle) Pi is a Greek letter and the value of Pi is equal to 3.14159265359. In the program, we will be initiating Pi as a global variable or we can simply import from the math module present in python. The syntax for importing pi from math module:   from import math. ALGORITHMS:- 1 .Input radius/diameter.     2 . Calculate the area of a circle using the formula.              area= pi*r*r(if radius is given as input).            ...
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