Answer:
Option B is correct
C=πD
Step-by-step explanation:
As per the statement:
If r is the radius of a circle and D is its diameter.
Given the circumference of the circle:
\(C = 2 \pi r\) .....[1]
where,
r is the radius of the circle.
We know that:
diameter(D) = 2r
Substitute in [1] we have;
\(C = \pi (2r) = \pi D\)
Therefore, the equivalent formula for the circumference C=2πr is, C=πD
