Calcula el area de la region rectangular PQRS , SI la base es el triple de la altura y el perimetro es 56 cm
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b = 3a
56 = 2(a+b)
56/2 = a+b
28 = a+b
28 = a + 3a
28 = 4a
a = 28/4
a = 7
b = 3a
b = 3*7
b = 21
Comprobación:
56 = 2(21+7)
56 = 2*28
Área = base*altura = 21*7 = 147
Respuesta:
El área es de:
147 cm²