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Vika [28.1K]
3 years ago
7

In a 30cm by 25cm rectangle, a quadrant of a circle of radius 7cm has been cut away from each corner. What is the perimeter of t

he part left? and also what is the area of the part left
​
Mathematics
1 answer:
Anton [14]3 years ago
5 0

Answer:

97.96 cm

596.14 cm²

Step-by-step explanation:

sides become:

  • 30 cm ⇒ 16 cm
  • 25 cm ⇒ 11 cm

and added corners:

  • 4*2πr/4= 2πr = 2*3.14*7 cm= 43.96 cm

then perimeter is:

  • P= 2*16+2*11+43.96= 97.96 cm

the area left is:

  • A= 30*25- 4*1/4*3.14*7²= 596.14 cm²

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Step-by-step explanation:

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What is the surface area of the box if it is scaled up by the factor of 10 and the surface area is 16in
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Going back to the problem at hand, we have the initial surface area of 16 square inches. The box is scaled up so that each dimension is 10 times larger, so the new surface area is 100 times what it used to be

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