Given the perimeter of a rectangle and either the length or width, find the unknown measurement using the appropriate formula.
2 answers:
The width is 18.
step by step:
1. 2 lengths are 20 which is 20+20 that's 40.
2. 76-40= 36
3. Two widths are 36 cm.
4. so do 36÷2 and that equals 18
The formula of a perimeter of a rectangle:
P = 2(w + l)
We have P = 76 cm and l = 20 cm.
Substitute:
2(w + 20) = 76 use distributive property
(2)(w) + (2)(20) = 76
2w + 40 = 76 subtract 40 from both sides
2w = 36 divide both sies by 2
w = 18
<h3>Answer: the width = 18 cm</h3>
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