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If a rectangular block that is 4 inches by 4 inches by 10 in

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If a rectangular block that is 4 inches by 4 inches by 10 in [#permalink] New post 18 May 2018, 15:01
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If a rectangular block that is 4 inches by 4 inches by 10 inches is placed inside a right circular cylinder of radius 3 inches and height 10 inches, the volume of the unoccupied portion of the cylinder is how many cubic inches?

(A) \(6\pi - 16\)

(B) \(9\pi - 16\)

(C) \(160 - 30\pi\)

(D) \(60\pi - 160\)

(E) \(90\pi - 160\)
[Reveal] Spoiler: OA

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Re: If a rectangular block that is 4 inches by 4 inches by 10 in [#permalink] New post 19 May 2018, 06:37
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Area of cylinder is Pi r^h

=Pi*3*3*10
=90Pi


Area of cuboid = l*b*h
=4*4*10 = 160

Volume unoccupied = 90Pi-160
Hence the answer
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Re: If a rectangular block that is 4 inches by 4 inches by 10 in [#permalink] New post 07 Jul 2018, 09:14
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Carcass wrote:
If a rectangular block that is 4 inches by 4 inches by 10 inches is placed inside a right circular cylinder of radius 3 inches and height 10 inches, the volume of the unoccupied portion of the cylinder is how many cubic inches?

(A) \(6\pi - 16\)

(B) \(9\pi - 16\)

(C) \(160 - 30\pi\)

(D) \(60\pi - 160\)

(E) \(90\pi - 160\)



Here,
we are required to find the volume of the un occupied portion so in that case let us take out the volume of the rectangular solid and cylinder

Volume of the rectangular solid = \(Length * Width * Height = 4 * 4 * 10 =160\)

And Total Volume of the Cylinder = \(\pi * Radius^2 * Height = \pi * 3^2 * 10 = 90\pi\)

Therefore the volume of the unoccupied portion of the cylinder = Total Volume of the Cylinder - Volume of the rectangular solid =\(\pi * 3^2 * 10 = 90\pi - 160\)
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Re: If a rectangular block that is 4 inches by 4 inches by 10 in   [#permalink] 07 Jul 2018, 09:14
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