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l = 10 ÷ 2 = 5 cm.
L = 10 × 5 = 50 cm².
Segitiga = a & t = 10 ÷ 2 = 5 cm.
L = 5 × 5 ÷ 2 = 12,5
Total = 50 - 12,5 = 37,5 cm².