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creativ13 [48]
2 years ago
15

A rectangular park, 90 meters by 60 meters, is to be built on a city block having an area of 9000 m^2. A uniform strip borders a

ll four sides of the park for parking. How wide is the strip? Use quadratic formula and show your work.
Mathematics
1 answer:
stealth61 [152]2 years ago
8 0

Answer:

x = 10.52 m

Step-by-step explanation:

Given that,

Length of a park = 90 m

Width of a park = 60 m

Area, A = 9000 m²

A uniform strip borders all four sides of the park for parking. We need to find the width of the strip. Let it is x. Now the area becomes,

(90+2x)(60+2x) = 9000

4x^2 +120x +180x =5400 = 9000\\\\x=10.52\ m

So, the width of the strip is equal to 10.52 m.

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Observe attached picture.

On picture we have:
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We can apply trigonometry rules to find height of flagpole.

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We see that these two equations have same left sides. This means that their right sides must also be same:
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