Question

Find each of the following for the circle.
Radius
Diameter
Circumference formula
Circumference of the circle

Answer 1

Note: please take radius as R

Radius:
radius is already given, it is R

Diameter
D = 2R

Circumference formula
C = pi*D

Circumference of the circle
Let's substitute found diameter into the previous formula:
C = pi*D = 2pi*R