tolong kakak ada pr matematika

6. Lingkaran

7. Diketahui : 7,5 cm
L = phi × r × r
L = 3,14 × 7,5 × 7,5
L = 176,625 cm2

8.Diketahui : D =21 cm, r = 1/2 d
r = 1/2(21) = 10,5 cm
L = phi × r × r
L = 3,14 × 10,5 × 10,5
L = 346,185 cm2

9. Diketahui : D = 196 cm, r = 1/2 d
r = 1/2 (196) = 98
L = phi × r × r
L = 22/7 × 98 × 98
L = 30.184 cm2

10. Diketahui = r = 14 cm, t = 14cm
V = phi × r × r × t
V = 22/7 × 14 × 14 × 14
V = 8624 cm3

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