(3.14r+r)×2=16.56(3.14r+r)×2=16.

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(3.14r+r)×2=16.56(3.14r+r)×2=16.
(3.14r+r)×2=16.56
(3.14r+r)×2=16.

(3.14r+r)×2=16.56(3.14r+r)×2=16.
(3.14r+r)×2=16.56
4.14r×2=16.56
r=16.56÷4.14÷2
r=2

3.14r+r)×2=16.56;
4.14r=8.28;
r=2;

(3.14r+r)×2=16.56
4.14r*2=16.56
4.14r=8.28
r=2

(3.14r+r)×2=16.56
4.14r=8.28
r=2