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# If the length of the longest chord of a certain circle is 10, what is

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Math Expert
Joined: 02 Sep 2009
Posts: 52392
If the length of the longest chord of a certain circle is 10, what is  [#permalink]

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29 Sep 2016, 03:36
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Difficulty:

5% (low)

Question Stats:

91% (00:22) correct 9% (01:01) wrong based on 82 sessions

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If the length of the longest chord of a certain circle is 10, what is the radius of that certain circle?

A. 2.5
B. 5
C. 10
D. 15
E. 20

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Joined: 26 Nov 2012
Posts: 592
Re: If the length of the longest chord of a certain circle is 10, what is  [#permalink]

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29 Sep 2016, 03:44
Bunuel wrote:
If the length of the longest chord of a certain circle is 10, what is the radius of that certain circle?

A. 2.5
B. 5
C. 10
D. 15
E. 20

Simple one..

Longest chord in a circle is diameter - d = 2r ( in terms of radius)

2r = 10 = > r = 5.

IMO option B.
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Re: If the length of the longest chord of a certain circle is 10, what is  [#permalink]

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29 Sep 2016, 04:27
Longest chord in a circle is diameter
Intern
Joined: 08 Nov 2015
Posts: 12
Re: If the length of the longest chord of a certain circle is 10, what is  [#permalink]

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29 Sep 2016, 10:38
Well worded question. Longest chord of a circle is the diameter (10 in this case). So radius of the circle is 5 (Option B)
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Re: If the length of the longest chord of a certain circle is 10, what is  [#permalink]

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02 Oct 2016, 05:51
Longest chord of a circle is the diameter of the circle
If diameter of the circle is given as 10 = 2 * 5
so radius of the circle = 5
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Re: If the length of the longest chord of a certain circle is 10, what is  [#permalink]

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27 Feb 2017, 03:26
Longest chord is diameter.
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Re: If the length of the longest chord of a certain circle is 10, what is &nbs [#permalink] 27 Feb 2017, 03:26
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