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(9 + 6)(7) = 105 cm²
Podemos dividir las areas sombreadas en la siguientes
Rectangulo de (5x7) = 35 cm²
Rectangulo de (4x7) = 28 cm²
Triangulo de Base = 7 Altura = 4
Triangulo = (7x4)/2 = 14 cm²
Triangulo de Base = 7, Altura = 2
Triangulo = (7x2)/2 = 7 cm²
Area Sombreada seria = 35 + 28 + 14 + 7 = 84 cm²
Area del triangulo sin sombrear = 105 - 84 = 21 cm²