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Kelas 8 MatematikaBab 6 - Lingkaran
Penyelesaian:
Luas juring = sudut pusat / 360° × Luas Lingkaran
31,4 = 25° / 360° × πr²
31,4 = 5 / 72 × 3,14 × r²
31,4 / 3,14 = 5 / 72 × r²
10 = 5 / 72 × r²
r² = 5 / 72 : 10
r² = 72 / 5 × 10
r² = 72 × 2
r² = 144
r = √144
r = 12 cm
Jawaban:
r = 12 cm
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