What is the circumference of a circle with a diameter of 21 m? (use for pi)

21π m, or ≈ 65.94 m

Step-by-step explanation:

Remember that π is the ratio between a circle's circumference and its diameter, or, in equation form:

where c is the circumference and d is the diameter. If we want to find the circumference, we can just multiply that equation by d on both sides to get

Here, our d = 21 m, so our circumference would be

m, or approximately 21(3.14) = 65.94 m

(-5,-28)

i graphed to on desmos.