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* D = 2r = 2 x 15 = 39
* K = 2πr = 2 x 3,14 x 15 = 94,2
* L = πr² = 3,14 x 15² = 706,5
2. Diket : r=10
* D = 2r = 2 x 10 = 20
* K = 2πr = 2 x 3,14 x 10 = 62,8
* L = πr² = 3,14 x 10² = 314 .
priksa kmbali
k1 = 2×π × r k2= 2×π×r
= 2 × 3,14 ×10 = 2 ×3,14 × 15
= 62,8 cm = 94,2 cm
L1 = π×r×r L2=π×r×r
= 3,14×10×10 =3,14×15×15
= 314 cm² = 706,5 cm² :D