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a = 4
b = 10
Area = 28 cm²
28 = h*[(4 + 10)/2]
28 = h*[7]
h = 28/7
h = 4 cm
Ahora base del triangulo sombreado = (10 - 4)/2 = 3 cm
Area triangulo = (Base x Altura)/2
Area = (3 x 4)/2 = 12 cm²/2 = 6cm²
Area Sombreada = 6 cm²