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11 Jan 2019, 01:35
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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:
5%
(low)
Question Stats:
93% (00:45) correct
7%
(00:47)
wrong
based on 90
sessions
History
Date
Time
Result
Not Attempted Yet
If points A, B, and C are the centers of the above circles and the circles have radii of 2,3, and 4 respectively, what is the perimeter of triangle ABC ?
A. 9
B. 3π
C. 12
D. 18
E. 9π
Attachment:
2019-01-11_1234.png [ 27.67 KiB | Viewed 4189 times ]
31 Mar 2020, 06:36
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Bunuel
Let's add a point at each of the three points where two circles touch
Since the radius of the smallest circle is 2, we can add that to our diagram to get:
When we do the same for the other two circles we get:
So, the perimeter of triangle ABC = 2 + 2 + 3 + 3 + 4 + 4
= 18
Answer: D
Cheers,
Brent
General Discussion
11 Jan 2019, 03:40
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Bunuel
perimeter would be 2* ( 2+3+4)
18
IMO D
