What's the circumference and area of r=5m

I'm guessing you want the circumference and area of a circle that has a radius of 5 meters?

circumference = 2 * PI * r

circumference = 2 * PI * 5

circumference = 10 * PI = 31.14159 meters

area = PI * r^2

area = 3.14159 * 5^2

area = 3.14159 * 25

area = 78.53982 square meters