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Region Q, shown here, is defined by

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Region Q, shown here, is defined by  [#permalink]

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25 Nov 2017, 11:11
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Difficulty:

95% (hard)

Question Stats:

48% (01:57) correct 52% (02:01) wrong based on 132 sessions

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Region Q, shown here, is defined by

$$(x−6)^{​2} +(y−4)^{2} \leq 100$$,

$$y\geq{0}$$, and $$x\geq{0}$$.

What is the approximate area of Region Q in square units?

A.between 75 and 125
B.between 125 and 175
C.between 175 and 225
D.between 225 and 275
E.between 275 and 325
Attachment:

Capture.PNG [ 25.12 KiB | Viewed 1615 times ]

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Joined: 02 Aug 2009
Posts: 7044
Re: Region Q, shown here, is defined by  [#permalink]

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26 Nov 2017, 01:44
2
Gnpth wrote:
Region Q, shown here, is defined by

$$(x−6)^{​2} +(y−4)^{2} \leq 100$$,

$$y\geq{0}$$, and $$x\geq{0}$$.

What is the approximate area of Region Q in square units?

A.between 75 and 125
B.between 125 and 175
C.between 175 and 225
D.between 225 and 275
E.between 275 and 325
Attachment:
The attachment Capture.PNG is no longer available

Look at the attached figure..
Ans C

Join the parallel lines as shown..
Attachments

IMG_20171126_151118.jpg [ 1.48 MiB | Viewed 1557 times ]

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Joined: 15 Oct 2017
Posts: 30
Location: Ireland
Concentration: Healthcare, Finance
Re: Region Q, shown here, is defined by  [#permalink]

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26 Nov 2017, 03:01
Gnpth wrote:
Region Q, shown here, is defined by

$$(x−6)^{​2} +(y−4)^{2} \leq 100$$,

$$y\geq{0}$$, and $$x\geq{0}$$.

What is the approximate area of Region Q in square units?

A.between 75 and 125
B.between 125 and 175
C.between 175 and 225
D.between 225 and 275
E.between 275 and 325
Attachment:
The attachment Capture.PNG is no longer available

As we can see the point (6,4) is a centre of the circle. The dash line is a radius wchich is 10. Circle area =$$\pi * r^2$$ $$= 100 *\pi$$ = 300

The shaded region is around $$\frac{2}{3}$$ of the circle area => $$\frac{2}{3} * 300 = 200$$

Attachments

circle1.jpg [ 20.07 KiB | Viewed 1531 times ]

Intern
Joined: 24 Jun 2017
Posts: 6
Re: Region Q, shown here, is defined by  [#permalink]

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28 Nov 2017, 23:44
Vorovski wrote:
Gnpth wrote:
Region Q, shown here, is defined by

$$(x−6)^{​2} +(y−4)^{2} \leq 100$$,

$$y\geq{0}$$, and $$x\geq{0}$$.

What is the approximate area of Region Q in square units?

A.between 75 and 125
B.between 125 and 175
C.between 175 and 225
D.between 225 and 275
E.between 275 and 325
Attachment:
Capture.PNG

As we can see the point (6,4) is a centre of the circle. The dash line is a radius wchich is 10. Circle area =$$\pi * r^2$$ $$= 100 *\pi$$ = 300

The shaded region is around $$\frac{2}{3}$$ of the circle area => $$\frac{2}{3} * 300 = 200$$

Can you eloborate how you arrived at 2/3??
Intern
Joined: 24 Jun 2017
Posts: 6
Re: Region Q, shown here, is defined by  [#permalink]

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28 Nov 2017, 23:45
1
chetan2u wrote:
Gnpth wrote:
Region Q, shown here, is defined by

$$(x−6)^{​2} +(y−4)^{2} \leq 100$$,

$$y\geq{0}$$, and $$x\geq{0}$$.

What is the approximate area of Region Q in square units?

A.between 75 and 125
B.between 125 and 175
C.between 175 and 225
D.between 225 and 275
E.between 275 and 325
Attachment:
Capture.PNG

Look at the attached figure..
Ans C

Join the parallel lines as shown..

Expert can you post a clear cut solution... image is not that clear?
Intern
Joined: 15 Oct 2017
Posts: 30
Location: Ireland
Concentration: Healthcare, Finance
Re: Region Q, shown here, is defined by  [#permalink]

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29 Nov 2017, 00:57
Vorovski wrote:
Gnpth wrote:
Region Q, shown here, is defined by

$$(x−6)^{​2} +(y−4)^{2} \leq 100$$,

$$y\geq{0}$$, and $$x\geq{0}$$.

What is the approximate area of Region Q in square units?

A.between 75 and 125
B.between 125 and 175
C.between 175 and 225
D.between 225 and 275
E.between 275 and 325
Attachment:
Capture.PNG

As we can see the point (6,4) is a centre of the circle. The dash line is a radius wchich is 10. Circle area =$$\pi * r^2$$ $$= 100 *\pi$$ = 300

The shaded region is around $$\frac{2}{3}$$ of the circle area => $$\frac{2}{3} * 300 = 200$$

Can you eloborate how you arrived at 2/3??

The shaded region is around 70% of the circle and 70% is around 2/3.
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 8580
Location: Pune, India
Re: Region Q, shown here, is defined by  [#permalink]

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29 Nov 2017, 02:20
2
Gnpth wrote:
Region Q, shown here, is defined by

$$(x−6)^{​2} +(y−4)^{2} \leq 100$$,

$$y\geq{0}$$, and $$x\geq{0}$$.

What is the approximate area of Region Q in square units?

A.between 75 and 125
B.between 125 and 175
C.between 175 and 225
D.between 225 and 275
E.between 275 and 325
Attachment:
Capture.PNG

The shaded region could be seen as sum of three areas: a quarter of a circle and two rectangles (the shaded region is a bit less)

Area of quarter of a circle $$= (\pi * r^2)/4 = (3.14 * 10^2)/4 = 314/4 = 75$$ approx

Area of each rectangle $$= 16*4 + 6*10 = 124$$

So total shaded area will be a bit less than 75 + 124 = 199

The reduced area at the top of the top rectangle is less than 6*2/2 = 6
The reduced area at the right of the lower triangle will be even less.

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Intern
Joined: 21 Feb 2017
Posts: 4
Re: Region Q, shown here, is defined by  [#permalink]

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26 Oct 2018, 19:41
1
A simpler approach- I drew a square around the entire shaded region, the length is 16 and the height is 14, 16x14 = 224, the shaded region would slightly be less than 224, giving you an answer of C
Intern
Joined: 22 Aug 2018
Posts: 9
Re: Region Q, shown here, is defined by  [#permalink]

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03 Nov 2018, 02:51
Interesting question. However can someone please clarify if this kind of question is indeed it in the scope of GMAT exam?

Thank you
Re: Region Q, shown here, is defined by &nbs [#permalink] 03 Nov 2018, 02:51
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