Sebuah bola memiliki luas permukaan 616 cm2. panjang jari-jari bola adalah
Bola
Lp = 4 × Ο × r²
616 = 4 × 22/7 × r²
154 = 22/7 × r²
(154 × 7) = 22 × r²
1.078 = 22 × r²
r² = 1.078 ÷ 22
r² = 49
r = √49
r = 7 cm
- LP Bola = 4Οr²
- 616 = 4 × 22/7 × r²
- 616 ÷ 4 = 22/7 × r²
- 154 = 22/7 × r²
- r² = 154 ÷ 22/7
- r² = 154 × 7/22
- r² = 1.078/22
- r² = 49
- r = √49
- r = 7 cm
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