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stich3 [128]
4 years ago
13

Given the perimeter of a rectangle and either the length or​ width, find the unknown measurement using the appropriate formula.

Mathematics
2 answers:
Yuki888 [10]4 years ago
8 0

p = 2l + 2w
P=Perimeter
L=Length
W=Width

Hints given are P= 76, L=20 so 2L=40

76=40+2w
76-40=2w
36=2w
18=w

bija089 [108]4 years ago
6 0

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       <em>use distributive property</em>

(2)(w) + (2)(20) = 76

2w + 40 = 76     <em>subtract 40 from both sides</em>

2w = 36       <em>divide both sies by 2</em>

w = 18

<h3>Answer: the width = 18 cm</h3>
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