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In the figure above, P, Q, R, and S are the midpoints of the sides of

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In the figure above, P, Q, R, and S are the midpoints of the sides of [#permalink]

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21 Dec 2017, 19:50
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In the figure above, P, Q, R, and S are the midpoints of the sides of rectangle ABCD. What is the area of the polygon APQCRS?

A. $$12\sqrt{3}$$

B. $$9\sqrt{3}$$

C. $$6\sqrt{3}$$

D. $$3\sqrt{3}$$

E. $$24$$

[Reveal] Spoiler:
Attachment:

Polygon.png [ 11.98 KiB | Viewed 666 times ]
[Reveal] Spoiler: OA

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Re: In the figure above, P, Q, R, and S are the midpoints of the sides of [#permalink]

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21 Dec 2017, 22:03
This is tough how to approach above question I thought of deleting the triangle bpq and srd area from triangle abcd and my result was polygon=3/4(area of abcd)..I don't know how to calculate abcd area.

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Joined: 21 Nov 2016
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Re: In the figure above, P, Q, R, and S are the midpoints of the sides of [#permalink]

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22 Dec 2017, 00:09
From the figure above, ang(QPA) = ang(CRS) , the sum of all internal angles = 180, therefore
180-x+180-x+30+90=180, x=150, right angled triangle is 30-60-90. From there, we can calculate BP = √3 and BQ=3

Area of rect(ABCD) = 12√3
Area of 2 triangles = 3√3

Area of polygon = 12√3-3√3 = 9√3

Please confirm if this is correct approach and answer
Intern
Joined: 09 Apr 2017
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Re: In the figure above, P, Q, R, and S are the midpoints of the sides of [#permalink]

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22 Dec 2017, 00:43
Area of PBQ is half of ABC, DRS half off ACD. Thus PBQ + SRD = ½ ABCD = PASRCQ.
2*sqrt(3) and x-30 gives hint of a triangle with 90-60-30. Thus, PB = sqrt(3), BQ =3.
Area of ABCD is: 2*sqrt(3)*2*3=12*sqrt(3).
Area of PASRCQ is 6*sqrt(3)

Please correct if it is wrong.
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Re: In the figure above, P, Q, R, and S are the midpoints of the sides of [#permalink]

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22 Dec 2017, 05:23
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Bunuel wrote:

In the figure above, P, Q, R, and S are the midpoints of the sides of rectangle ABCD. What is the area of the polygon APQCRS?

A. $$12\sqrt{3}$$

B. $$9\sqrt{3}$$

C. $$6\sqrt{3}$$

D. $$3\sqrt{3}$$

E. $$24$$

[Reveal] Spoiler:
Attachment:
The attachment Polygon.png is no longer available

In addition to the solutions offered above, we'll also show a more visual, graphical answer.
This is an Alternative approach and relies on the fact that there is only one way to draw the given figure (as the points P,Q,R,S are midpoints of a rectangle).

Connecting the points P,Q,R and S to each other gives the below image.
We can SEE that drawing the lines has divided the rectangle into 8 identical triangles.
Therefore, our total area is the area of 6 of these triangles.

To complete the calculation, notice that $$\angle QPR$$ and $$\angle PRS$$ are equal because PQ is parallel to RS.
(once again - since there is only one way to draw this figure, you can SEE that they are parallel)
This means that $$x - 90 + x - 120 = 90$$ so $$2x = 300$$ and $$x = 150$$.
Then $$\triangle PQO$$ is a 30-60-90 triangle with sides of $$\sqrt3$$ and $$3$$ so its area is $$1.5 \sqrt{3}$$.
Multiplying by 6 gives $$9 \sqrt{3}$$.
(B) is our answer.
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img.png [ 41.05 KiB | Viewed 372 times ]

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In the figure above, P, Q, R, and S are the midpoints of the sides of [#permalink]

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23 Dec 2017, 09:17
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Bunuel wrote:

In the figure above, P, Q, R, and S are the midpoints of the sides of rectangle ABCD. What is the area of the polygon APQCRS?

A. $$12\sqrt{3}$$

B. $$9\sqrt{3}$$

C. $$6\sqrt{3}$$

D. $$3\sqrt{3}$$

E. $$24$$

[Reveal] Spoiler:
Attachment:
Polygon.png

PQRS is a rectangle and the sum of the interior angles is: $$360 = x + (x-30)+x +(x-30)$$ so $$x = 150$$

$$BQP = BQC - x$$; BQC is a straight line and $$x=150$$, so: $$BQP = 180 - 150 = 30$$

PBQ is a right angle and its angles are $$30:60:90$$, which means that its sides must be: $$s:s√3:2s$$

If PQ is the hypotenuse $$2√3=2s$$, then the other sides $$BQ=(√3*√3)=3$$ and $$BP=√3$$

Area of PBQ = Area of SRD which is $$\frac{base*height}{2}=\frac{3√3}{2}$$.

Area of ABCD is $$[(BP*2)*(BQ*2)]=[(2√3)*(6)]=12√3$$

Area of APQCRS = Area of ABCD - Area of Triangles (PBQ and SRD):

$$12√3 - {(\frac{3√3}{2}+\frac{3√3}{2})} = 12√3 - \frac{6√3}{2}=\frac{(24√3-6√3)}{2}=9√3$$

(B) is the answer.
In the figure above, P, Q, R, and S are the midpoints of the sides of   [#permalink] 23 Dec 2017, 09:17
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In the figure above, P, Q, R, and S are the midpoints of the sides of

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