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