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02 Jun 2020, 05:11
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
81% (01:06) correct
19%
(01:20)
wrong
based on 77
sessions
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Time
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Not Attempted Yet
If point O is the center of the circle as shown in the figure, what is the area of the circle (in sq. cm.) ?
(1) Length of the major arc ACB is 9π cm.
(2) Area of ΔOAB = 18 sq. cm.
Attachment:
1.png [ 14.64 KiB | Viewed 2436 times ]
02 Jun 2020, 05:20
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Bunuel
Question: Area = ? i.e. Radius = ?
Statement 1: \((\frac{3}{4})2πr = 9π\)
SUFFICIENT
STatement 2: Area of ΔOAB = 18 sq. cm.
i.e. \((\frac{1}{2})r^2 = 18\)
i.e. r = 6
SUFFICIENT
Answer: Option D
i believe it is D. both sufficient
1. USE CIRCUMFERENCE FORMULA
9PIE= PIE*Diameter*3/4 (270/360). solve for Diameter and find Radius for area
2. use area formula:
PIE*R^2*1/4 (90/360)=18^2. Solve for R AND FIND TOTAL AREA
SO, I SEE IF IT WAS A PS I WAS WRONG. I SEE IT IS THE AREA OF THE TRIANGLE.
1. USE CIRCUMFERENCE FORMULA
9PIE= PIE*Diameter*3/4 (270/360). solve for Diameter and find Radius for area
2. use area formula:
PIE*R^2*1/4 (90/360)=18^2. Solve for R AND FIND TOTAL AREA
SO, I SEE IF IT WAS A PS I WAS WRONG. I SEE IT IS THE AREA OF THE TRIANGLE.
