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Given the perimeter of a rectangle and either the length or width, find the unknown measurement using the appropriate formula. The Perimeter is 76 cm and the length is 20 cm. What is the width of the rectangle? Show all your work.

Respuesta :

gmany

The formula of a perimeter of a rectangle l × w:

P = 2l + 2w

We have the perimeter P = 76 cm and the length l = 20 cm. Substitute:

76 = 2(20) + 2w

76 = 40 + 2w    subtract 40 from both sides

36 = 2w     divide both sides by 2

18 = w

Answer: width = 18 cm.

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