How do you calculate the circumference of a circle if you know the are

C = 2√(Aπ).

Step-by-step explanation:

The area A  = π r^2      where r = radius

and the circumference = 2 π r.

From the formula for the area r = √(A / π)

So the circumference is found by substituting in C = 2 π r for r:

C =  2 π √(A / π)

C = 2√(Aπ).

r and t.

both are 64 degrees.

answer: do we write it

step-by-step explanation: