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Luas segitiga = 1/2 x 6 x 4 = 12 cm²
Luas permukaan
= 2 x luas segitiga + 2x Luas BEFC + Luas ABED
= 2x12 + 2x5x10 + 6x10
= 24 + 100 + 60
= 184 cm² (C)