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Verified answer
CG² = CF² - DE²CG² = 225 - 144
CG² = 81
CG = 9 cm
DC = DG - CG
DC = 15 + 9 = 24 cm
luas trapesium = [12 x (15 + 24)]/2
= 234 cm²
luas jejaran genjang = CD x BG = 24 x 8 = 208 cm²
luas total = 208 + 234 = 442 cm²