Penjelasan dengan langkah-langkah:
jari-jari = 1/2diameter
jari-jari = 1/2 × 42 = 21
rumus luas lingkaran = πr²
L = πr²
= 22/7 × 21 × 21
= 22 × 3 × 21
= 1386 cm²
Jawaban:
1386 cm²
Jari-jari = 42 : 2 = 21
[tex]\pi r^{2} = \frac{22}{7} \times 21 \times 21 \\ = 22 \times 3 \times 21 \\ = 1386 \: cm ^{2} [/tex]
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Penjelasan dengan langkah-langkah:
jari-jari = 1/2diameter
jari-jari = 1/2 × 42 = 21
rumus luas lingkaran = πr²
L = πr²
= 22/7 × 21 × 21
= 22 × 3 × 21
= 1386 cm²
Jawaban:
1386 cm²
Penjelasan dengan langkah-langkah:
Jari-jari = 42 : 2 = 21
[tex]\pi r^{2} = \frac{22}{7} \times 21 \times 21 \\ = 22 \times 3 \times 21 \\ = 1386 \: cm ^{2} [/tex]