a) aire ABC = 3 × 1,5 ÷ 2 = 2,25 cm²
b) aire A'B'C' = aire ABC × 6² = 2,25 × 36 = 81 cm²
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a) aire ABC = 3 × 1,5 ÷ 2 = 2,25 cm²
b) aire A'B'C' = aire ABC × 6² = 2,25 × 36 = 81 cm²