Cornelius is building a solar system model. He plans on making a circular ring around one of the planets out of wire.

He wants to know how long he should make the wire to position around the planet. Select all the formulas that could be used to determine the length of the circular ring.

C = πd
C = 2πr
C = πd2
A = πr2
A = πr
A = πd

1 answer

C = 2πr

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