Sudut pusat =120 Panjang busur=88 Maka jari jarinya=? Tetep pakai cara

Panjang busur = sudut pusat/360° × 2πr
88 = 120°/360° × 2 × 22/7 × r
88 × 7 = 1/3 × 44 r
88 × 7 × 3 = 44r
r = 88 × 21/44
r = 2 × 21
r = 42 cm

Jari2 lingkaran = 42 cm