C = (pi)/d
or c = 2(pi)r.
Chat with our AI personalities
the perimiter =D
to find the perimiter you just add up all the sides....Perimiter is the same for every figure.
Run a piece of string round the edge and then measure it
The perimeter of a circle is called it circumference, "C". To calculate it, multiply its diameter by the constant, pi. Pi is roughly equal to 3.14159265. So, let's say you have a circle with a 10-foot diameter. Then C=10 x 3.14159265 = 31.42 (rounded off).
base times height minus half of the perimiter base times height minus half of the perimiter