Tolong pakai Cara nya ya

8. L juring = a°/360° × πr²
10 = a/360 × π × 4²
10 = a/360 × π × 16
10 = a/45 × π × 2
10 = a × 2π/45
10 × 45/2π = a
225/π = a

panjang busur = a/360 × 2πr
= (225/π)/360 × 2π × 4
= 225/π × π/45
= 225/45
= 5

10. 56 cm = 0,56 m
K = πd
= 3,14 × 0,56
= 1,7584 m

1,7584 × 200 = 351,68 m = 352 m