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jadi OP = 10-4 = 6CM
AP = triple pytagoras 8 cm
Luas lingkaran = 108/360 × 3,14 ×10×10=94,2 cm^2
luas segitiga = 2×6×8÷2 = 48 cm^2
jadi luas tembereng = 94,2 - 48 = 46,2 cm^2