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12 Aug 2020, 02:34
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C
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Difficulty:
15%
(low)
Question Stats:
78% (01:03) correct
22%
(01:13)
wrong
based on 92
sessions
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Time
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What is the unit area of circle O on the standard xy-coordinate plane?
(1) Point R(7,23) and point S(7,7) both lie along the circumference of circle O.
(2) R and S are the endpoints of the longest possible chord of circle O.
(1) Point R(7,23) and point S(7,7) both lie along the circumference of circle O.
(2) R and S are the endpoints of the longest possible chord of circle O.
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12 Aug 2020, 03:11
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1) R and S could be all chord or diameter making the value of radius change with its position. (insufficient)
2) RS is a diameter, but what's the length? (Insufficient)
Combining Both:.
Length of RS = 16
Radius = 8
Area = π*8*8 = 64π
(Sufficient)
Answer is C
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2) RS is a diameter, but what's the length? (Insufficient)
Combining Both:.
Length of RS = 16
Radius = 8
Area = π*8*8 = 64π
(Sufficient)
Answer is C
Posted from my mobile device
12 Aug 2020, 03:42
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IMO C.
Statement 1 is insufficient as we dont know that those two points are whether of diameter or any other chord.
Statement 2 is insufficient as the longest chord is nothing but diameter of the circle. but we donot have length of the diameter
On combining,
We have diameter ,we can have radius and so the area could be found out.
Statement 1 is insufficient as we dont know that those two points are whether of diameter or any other chord.
Statement 2 is insufficient as the longest chord is nothing but diameter of the circle. but we donot have length of the diameter
On combining,
We have diameter ,we can have radius and so the area could be found out.
