calculating the area of a disk
The area of a disk is given by the formula `A=pi*r^2`, where r is the radius of the circle.
Give an approximate value to 2 decimal places of the area of a disk of radius 13.
Give an approximate value to 2 decimal places of the area of a disk of radius 13.
This type of exercise can be solved using the function : area_circle
Course reminder : Geometry