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Mrrafil [7]
3 years ago
6

The Length of a rectangle is 5 centimeters less than twice its width . The perimeter of the rectangle is 80cm. What are the dime

nsions of the rectangle ?
Mathematics
1 answer:
borishaifa [10]3 years ago
7 0
Perimeter is the sum of all a shapes sides.

with that in mind, we know a rectangle has four sides. with 2 pairs being the same.

The length as told is, 5 centimeters less than two times the width. Two times the width would be 2w and five less than that would be minus five. so the length is 2w - 5

now to find the perimeter we do two times the width + two times the length.

2w + 2(2w -5) = 80.
Distribute: 2w + 4w - 10 = 80
Add ten to both sides and combine the 2w & 4w:
6w = 90
Divide both sides by 6: w = 15.

with this we know the width is 15. to find length plug in 15 to the 2w - 5 equation.

2(15) - 5 = 30 - 5 = 25.

Slap on the units and width = 15 cm, length = 25 cm


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Instructions: The polygons in each pair are similar. Find the<br> missing side length.
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the proportion part in your picture is a bit confusing :

yes,

x/15 = 32/40 = 32/40

I don't know, why this last expression was repeated.

x/15 = 32/40

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as you see we get of course the same result doing it that way.

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if you do 10.5x3.5                                                                                                5x5=25                                                                                                                5x0+2=7                                                                                                              5x1=5 so that will be 57.5 then your going to do                                                3x5=15                                                                                                                3x0+1=4                                                                                                           3x1=3  that equals 34.5 then your going to add                          57.5                                                                                                                 +34.5
= 92.0
7 0
3 years ago
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