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12. the length of a rectangle is 4 centimeters less than twice its widt…

Question

  1. the length of a rectangle is 4 centimeters less than twice its width. the perimeter of the rectangle is 34 cm. what are the dimensions of the rectangle?

length = 9 cm, width = 8 cm
length = 7 cm, width = 10 cm
length = 10 cm, width = 7 cm
length = 14 cm, width = 9 cm

Explanation:

Step1: Definir variables

Sea la anchura \( w \) del rectángulo. Entonces, la longitud \( l = 2w - 4 \).

Step2: Usar la fórmula del perímetro

La fórmula del perímetro de un rectángulo es \( P=2(l + w) \). Dado que \( P = 34 \), sustituimos \( l \):

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Step3: Calcular la longitud

Sustituimos \( w = 7 \) en \( l = 2w - 4 \):
\( l=2\times7 - 4=14 - 4 = 10 \)

Answer:

length = 10 cm, width = 7 cm