Jawaban:
154 cm²
Penjelasan dengan langkah-langkah:
diameter = 42 cm
r = 42 : 2 = 21 cm
dipotong 9 bagian sama besar
luas masing2 potongan
[tex] = \pi \: {r}^{2} \div 9[/tex]
[tex] = \frac{22}{7} \times 21 \times 21 \div 9[/tex]
= 22 × 3 × 21 ÷ 9
= 22 × 63 : 9
= 22 × 7
= 154 cm²
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Jawaban:
154 cm²
Penjelasan dengan langkah-langkah:
diameter = 42 cm
r = 42 : 2 = 21 cm
dipotong 9 bagian sama besar
luas masing2 potongan
[tex] = \pi \: {r}^{2} \div 9[/tex]
[tex] = \frac{22}{7} \times 21 \times 21 \div 9[/tex]
= 22 × 3 × 21 ÷ 9
= 22 × 63 : 9
= 22 × 7
= 154 cm²