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Question
- 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
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 \( l = 2w - 4 \):
\( l=2\times7 - 4=14 - 4 = 10 \)
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length = 10 cm, width = 7 cm