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= 1/2 x 2 x π x r
= 1/2 x 2 x 22/7 x 10,5
= 33
Keliling = 33 + 21 = 54
= 1/2 x π x d + d
= 1/2 x 22/7 x 21 + 21
= 33 + 21
= 54 Cm