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28 May 2018, 18:23
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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If O is the center of the circle, what is the area of the shaded region?
A. OB = 5cm
B. \(\angle BCO\) = \(\angle ACO\) = \(30^{\circ}\)
A. OB = 5cm
B. \(\angle BCO\) = \(\angle ACO\) = \(30^{\circ}\)
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28 May 2018, 18:42
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GMATSkilled
If O is the center of the circle, what is the area of the shaded region?
A. OB = 5cm
B. \(\angle BCO\) = \(\angle ACO\) = \(30^{\circ}\)
A. OB = 5cm
B. \(\angle BCO\) = \(\angle ACO\) = \(30^{\circ}\)
Clearly ..
Just the side or just the angle will not give us the answer..
A. OB=5..
So we know the radius but nothing about the shaded portion..
Insufficient
B. \(\angle BCO\) = \(\angle ACO\) = \(30^{\circ}\)
This tells us that BCO and ACO are 30-30-120 triangles
Nothing about sides.
Combined..
Unique triangles can be made as all angles and two sides are known. So the area can be measured.
Sufficient
C
vishuvashishth
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29 May 2018, 20:45
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chetan2u
Hi Chetan,
Could you please clarify my doubt,
since we know ob is radius = 5 . OA and OC will also be equal to 5 as these are radius as well. Now, we know OB, OA and OC , we can find BC and AC. Hence the area of triangle ABC can be found. What am I doing incorrect here ?
Hi Chetan,
Could you please clarify my doubt,
since we know ob is radius = 5 . OA and OC will also be equal to 5 as these are radius as well. Now, we know OB, OA and OC , we can find BC and AC. Hence the area of triangle ABC can be found. What am I doing incorrect here ?
