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7. K = π.d
k = 22/7 .1,4
k = 0,2 x 22
k = 4,4 m
100 k = 4,4 x 100
= 440 meter (C)

8. L = πr²
L = 22/7 .1,4 .1,4
L = 6,16 cm² *mendekati (B)

9. K= α/360° x πd
314 cm = 1/5 x 3,14 x d
d = 314 x /3.14 x 1/5
d = 500 cm

L = α/360° x πr²
= 1/5 x 3,14 x 6,250
= 3,925 cm²