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triangulo= 12+3x+3x = 12+6x (a)
cuadrado=10+10+2x+2x = 20+4x (b)
perimetro triangulo = perimetro cuadrado
12+ 6x= 20 +4x
despejando x:
6x-4x=20-12
2x=8
x=8/2
x=4
Triangulo
Lados
12 cm
3x=3*4=12 cm
3x=3*4=12cm
perimetro
12+12+12=36 cm
CUADRADO
lados
10 cm
10 cm
2x=2*4=8 cm
2x=2*4=8 cm
perimetro
10+10+8+8= 36cm