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# If each curved portion of the boundary of the figure attached is forme

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Math Expert
Joined: 02 Sep 2009
Posts: 53063
If each curved portion of the boundary of the figure attached is forme  [#permalink]

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18 Aug 2015, 08:19
00:00

Difficulty:

55% (hard)

Question Stats:

63% (01:44) correct 37% (01:58) wrong based on 193 sessions

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If each curved portion of the boundary of the figure above is formed from the circumference of two semicircles, each with a radius of 2, and each of the parallel sides has length 4, what is the area of the shaded figure?

A. 16
B. 32
C. $$16-8\pi$$
D. $$32-8\pi$$
E. $$32-4\pi$$

Attachment:

Kaplan.png [ 8.21 KiB | Viewed 2465 times ]

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Re: If each curved portion of the boundary of the figure attached is forme  [#permalink]

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18 Aug 2015, 09:21
Bunuel wrote:

If each curved portion of the boundary of the figure above is formed from the circumference of two semicircles, each with a radius of 2, and each of the parallel sides has length 4, what is the area of the shaded figure?

A. 16
B. 32
C. $$16-8\pi$$
D. $$32-8\pi$$
E. $$32-4\pi$$

Attachment:
Kaplan.png

The rectangle created by the 2 parallel lines is of dimensions 4X8 = 32 units^2

The 4 semicircular regions will provide a net = 0 impact on the total area of the figure. Thus the total area of the figure = 32 $$\pm$$0 = 32. B is the correct answer.
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Re: If each curved portion of the boundary of the figure attached is forme  [#permalink]

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18 Aug 2015, 20:16
1
Bunuel wrote:

If each curved portion of the boundary of the figure above is formed from the circumference of two semicircles, each with a radius of 2, and each of the parallel sides has length 4, what is the area of the shaded figure?

A. 16
B. 32
C. $$16-8\pi$$
D. $$32-8\pi$$
E. $$32-4\pi$$

Attachment:
The attachment Kaplan.png is no longer available

IMO : B =32

Shaded figure looks like a rectangle with 2 Semicircles added and 2 semicircles removed.
Now those 2 added semicircles will cancel out with the removed semicircles. Check out the below figure
Attachment:

11.jpg [ 14.06 KiB | Viewed 2021 times ]

The area of the shaded region is nothing but the area of the rectangle with sides 4 and 8.
Area = 8*4 =32
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Re: If each curved portion of the boundary of the figure attached is forme  [#permalink]

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18 Aug 2015, 20:42
2
Bunuel wrote:
If each curved portion of the boundary of the figure above is formed from the circumference of two semicircles, each with a radius of 2, and each of the parallel sides has length 4, what is the area of the shaded figure?

A. 16
B. 32
C. $$16-8\pi$$
D. $$32-8\pi$$
E. $$32-4\pi$$

Ans: B
Solution: If we shift these semicircle, which are out ward dense, to the blank space of the same size in between parallel lines we will get one big rectangle. so practically we need to find the area of the rectangle only.

which is 8x4= 32 [Ans]
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Re: If each curved portion of the boundary of the figure attached is forme  [#permalink]

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27 Feb 2016, 00:20
i thought the figure will form a rectangle when we stretch the sheet
But length will be 4 and breath will be combined circumference of two circle=2pir=4pi.
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Re: If each curved portion of the boundary of the figure attached is forme  [#permalink]

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27 Feb 2016, 04:38
mahakmalik wrote:
i thought the figure will form a rectangle when we stretch the sheet
But length will be 4 and breath will be combined circumference of two circle=2pir=4pi.

Refer to if-each-curved-portion-of-the-boundary-of-the-figure-attached-is-forme-203894.html#p1562850
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Re: If each curved portion of the boundary of the figure attached is forme  [#permalink]

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19 Oct 2018, 09:15
Bunuel wrote:

If each curved portion of the boundary of the figure above is formed from the circumference of two semicircles, each with a radius of 2, and each of the parallel sides has length 4, what is the area of the shaded figure?

A. 16
B. 32
C. $$16-8\pi$$
D. $$32-8\pi$$
E. $$32-4\pi$$

Attachment:
Kaplan.png

Hi chetan2u,

Two semi circles circumference makes one whole circle circumference. So basically in this question we have to find the surface area of a cylinder with a height of 4 cms and radius 2 cms

so $$2*\pi *2$$ *4 = $$16\pi$$
what's wrong with this logic ? Why is this not leading to the answer?
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Joined: 02 Aug 2009
Posts: 7334
Re: If each curved portion of the boundary of the figure attached is forme  [#permalink]

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20 Oct 2018, 05:55
stne wrote:
Bunuel wrote:

If each curved portion of the boundary of the figure above is formed from the circumference of two semicircles, each with a radius of 2, and each of the parallel sides has length 4, what is the area of the shaded figure?

A. 16
B. 32
C. $$16-8\pi$$
D. $$32-8\pi$$
E. $$32-4\pi$$

Attachment:
Kaplan.png

Hi chetan2u,

Two semi circles circumference makes one whole circle circumference. So basically in this question we have to find the surface area of a cylinder with a height of 4 cms and radius 2 cms

so $$2*\pi *2$$ *4 = $$16\pi$$
what's wrong with this logic ? Why is this not leading to the answer?

You are going wrong because you are taking it as a 3-d figure whereas it is just a 2-dimensional figure or a figure on a page..
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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html
4) Base while finding % increase and % decrease : https://gmatclub.com/forum/percentage-increase-decrease-what-should-be-the-denominator-287528.html

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Re: If each curved portion of the boundary of the figure attached is forme  [#permalink]

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27 Oct 2018, 06:03
* Each of the parallel side as 4 cm- For which the given figure above will be a square.

Area of square = 16
Area of 2 circle with radius 2 = 8pi^2

Area of shaded portion - 16- 8pi

(All Area in sq.cm and radius in cm)

Please let me know my mistake in solving the problem
Re: If each curved portion of the boundary of the figure attached is forme   [#permalink] 27 Oct 2018, 06:03
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