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Keliling = 3 + 4 + 7 + 5 + 12 + 24 + 7 = 62
Luas = (3 × 4 ÷ 2) + (12 × 5 ÷ 2) + (7 × 24 ÷ 2)
= 6 + 30 + 84
= 120 cm