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Tembereng = besar sudut * L.lingkaran
= 107.5/360 * π×r²
= 107.5/360 * 3.14×27×27
= 246073.95/360
= 683.54 cm²
L.segitiga = 1/2*a*t
= 1/2*27*t
= 13.5 t
L.tembereng = 683.54 - 13.5t = 670.04 t
Gitu bukan?
Maaf kalau salah, t-nya gatau....