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r = 8 : 2 = 4 , 2.n.r = 2 x 3,14 x 4 = 25, 12
b. k.l = 2 x n x r
r = 15 : 2 = 7,5, k.l = 2 x n x r = 2 x 3,14 x 7,5 = 47,1
c. k.l = 2 x n x r
r = 11 : 2 = 5,5, k.l = 2 x 3,14 x 5,5 = 34,54
d. k.l = 2 x n x r
r = 16 : 2 = 8, k.l = 2 x 8 x 3,14 = 50,24
e. k.l = 2 x n x r
r = 25 : 2 = 12,5, k.l = 2 x n x r = 2 x 3,14 x 12,5 = 78,5
f. keliling lingkaran = 2 x n x r
r = 35 : 2 = 17,5, keliling lingkaran = 2 x 3,14 x 17, 5 = 109,9