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b=3h
2b+2h=16
sustituimos b=3h,en la segunda ecuacion
2b+2h=16
2(3h)+2h=16
6h+2h=16
8h=16
h=16/8
h=2
si h=2......b=3h....b=3(2)......b=6
b=6 h=2
respuesta: la altura mide 2 cm y la base mide 6 cm
A=bh
A=(6)(2)
A=12 cm²
el area es 12 cm²
base = 3x
Altura = x
Perimetro = 3x +x +3x +x
16cm = 8x
16cm/8 = x
2cm = x
La altura = 2cm
Base = 3x = 3*2cm = 6cm
Area = base por altura
A = 6cm * 2cm
A = 12cm²
El area del rectangulo = 12cm²