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Verified answer
Kelas 8 MatematikaBab Lingkaran
1] Luas juring = 462
a/360° . luas lingkaran = 462
a/360° . 616 = 462
a = 462 . 360°/616
a = 270°
2] 9² + 12² = 15²
81 + 144 = 225
Karena tripel pythagoras, maka
r = L/s
r = (1/2 . a . b)/(1/2 . (a + b + c))
r = (9 . 12)/(9 + 12 + 15)
r = 108 / 36
r = 3 cm