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Penjelasan dengan langkah-langkah:
1. a. L = πr²
= 22/7 × 7 cm × 7 cm
= 154 cm²
K = 2πr
= 2 × 22/7 × 7 cm
= 44 cm
b. L = πr²
= 3,14 × 10 cm × 10 cm
= 314 cm²
K = πd
= 3,14 × 20
= 62,8 cm
2. a. Luas juring = α/360° x π r²
= 60°/360° x 22/7 x 7 x 7
= 1/6 x 22 x 7
= 25,66 cm²
Panjang busur = α/360° × πd
= 60°/360°×πd
= 1/6 × 22/7 × 14
= 7,33 cm
b. Luas juring = α/360° × πr²
= 45°/360°× 314
= 39,25 cm²
Panjang busur = α/360° × πd
= 45°/360° × 62,8
= 7,85 cm
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