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2) Panjang busur = 3 x π/3 = π satuan
3) Luas sektor = 3π/2 satuan
4) Luas Tembereng = α/360' x πr² - luas Δ
panjang busur=3 xπ /3=πsatuan
lluas sektor=3π/2 satuan
lua temberang=α360 x πr²-luasΔ