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# What is the circumference of the circle above with center O?

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Math Expert
Joined: 02 Sep 2009
Posts: 52971
What is the circumference of the circle above with center O?  [#permalink]

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06 Sep 2018, 00:19
00:00

Difficulty:

25% (medium)

Question Stats:

84% (00:43) correct 16% (01:04) wrong based on 27 sessions

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What is the circumference of the circle above with center O?

(1) The area of the triangle is 50.
(2) The area of the sector is 25π

Attachment:

image001 (3).jpg [ 3.79 KiB | Viewed 382 times ]

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Re: What is the circumference of the circle above with center O?  [#permalink]

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06 Sep 2018, 04:16
Bunuel wrote:

What is the circumference of the circle above with center O?

(1) The area of the triangle is 50.
(2) The area of the sector is 25π

Attachment:
image001 (3).jpg

Question : What is the circumference of the circle above with center O (i.e. Semi circle)?

Statement 1: The area of the triangle is 50.

i.e. (!/2)*r*r = 50 where r is the radius of teh circle
i.e. r = 10 hence

SUFFICIENT

Statement 2: The area of the sector is 25π

i.e. (1/4)πr^2 = 25π

i.e. r = 10

SUFFICIENT

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Re: What is the circumference of the circle above with center O?   [#permalink] 06 Sep 2018, 04:16
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