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Luas ACDE = 1/2 x 2 x AF x 2 x CF = 2 x 6 x 8 = 96 cm²
Luas segitiga sama sisi dgn sisinya a adalah a/4√3
Luas Segitiga sama sisi ABC dengan sisi 10 cm adalag 10/4√3 cm² = 5/2√3 cm²
Luas ABCDE = Luas ACDE + Luas ABC = 96 + 5/2 √3 cm²