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Do the two circles with centers X and Y touch each other externally?

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Do the two circles with centers X and Y touch each other externally?  [#permalink]

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New post 03 Jul 2018, 11:06
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Question Stats:

38% (00:44) correct 63% (00:57) wrong based on 40 sessions

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Do the two circles with centers X and Y touch each other externally?

(1) The distance between X and Y is equal to the diameter of the circle with center X.
(2) One circle is bigger than the other.

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Re: Do the two circles with centers X and Y touch each other externally?  [#permalink]

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New post 04 Jul 2018, 00:43
1
Bunuel wrote:
Do the two circles with centers X and Y touch each other externally?

(1) The distance between X and Y is equal to the diameter of the circle with center X.
(2) One circle is bigger than the other.




(1) The distance between X and Y is equal to the diameter of the circle with center X.
so radius of X is half of the distance between x and y..
if radius of y = radius of x, the two circles will touch each other as shown by blue circles in att figure
otherwise ans is NO
We do not know about x
insuff

(2) One circle is bigger than the other
they could still meet if distance between centers = sum of radius
insuff

combined
they will not meet
sufficient

C
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3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


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Re: Do the two circles with centers X and Y touch each other externally?  [#permalink]

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New post 04 Jul 2018, 02:21
Re: Do the two circles with centers X and Y touch each other externally? &nbs [#permalink] 04 Jul 2018, 02:21
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