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vodka [1.7K]
3 years ago
6

What's the circumference of a circle with a radius of 7 in? round your answer to the nearest inch

Mathematics
1 answer:
iren [92.7K]3 years ago
4 0
It would be 44 in. The reason being the equation to find circumference is:
2\pi r
You use 3.14 for pi and the radius is 7.
2 \times 3.14 \times 7 = 43.96
43.96 rounded to the nearest inch is 44.
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Question 2

------------------------------------------------------------------------------------------
Formula
------------------------------------------------------------------------------------------
Volume of the cylinder = πr²h

------------------------------------------------------------------------------------------
Find Radius
------------------------------------------------------------------------------------------
Radius = Diameter ÷ 2
Radius = 10 ÷ 2
Radius = 5 ft

------------------------------------------------------------------------------------------
Find Volume
------------------------------------------------------------------------------------------
Volume = πr²h
Volume = 3.14 x 5² x 21
Volume = 1648.5 ft³

------------------------------------------------------------------------------------------
Answer: Volume = 1648.5 ft³
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Question 3

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Formula
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Volume of a sphere = 4/3πr³

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Find Volume
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Volume = 4/3 x 3.14 x 20³
Volume = 33493.3 ft³ (nearest tenth)

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Answer: Volume = 33493.3 ft³ 
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