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ABC is a triangle whose sides AB and BC have length of 3 and 5 respect

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Joined: 02 Jan 2017
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ABC is a triangle whose sides AB and BC have length of 3 and 5 respect  [#permalink]

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New post 15 Mar 2017, 05:03
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

63% (00:53) correct 37% (01:10) wrong based on 69 sessions

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ABC is a triangle whose sides AB and BC have length of 3 and 5 respectively. Which of the following could be the length of side AC?

(I) 8
(II) 12
(III) 0.5

A) (I) only
B) (II) only
C) (III) only
D) (I) and (II) only
E) None
Magoosh GMAT Instructor
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Joined: 28 Dec 2011
Posts: 4485
Re: ABC is a triangle whose sides AB and BC have length of 3 and 5 respect  [#permalink]

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New post 15 Mar 2017, 13:48
2
vikasp99 wrote:
ABC is a triangle whose sides AB and BC have length of 3 and 5 respectively. Which of the following could be the length of side AC?

(I) 8
(II) 12
(III) 0.5

A) (I) only
B) (II) only
C) (III) only
D) (I) and (II) only
E) None

Dear vikasp99,

I'm happy to respond. :-)

This question tests one specific geometry fact: The Triangle Inequality. See:
Facts about Ordinary Triangles on the GMAT

The Triangle Inequality says that the sum of any two sides a triangle must be greater than the third.

Let x be the third side. If it's the longest side, it must be true that
x < 3 + 5
x < 8
So it must be true that x is less than 8. (II) is definitely out, and (I) is out also. Think about it: if the third side were 8, the sides of 3 and 5 would have to lie flat, stretched their full length, just to connect to the two ends of the 8, and then we would have line segments on top of one another, rather than a triangle. A triangle has to have an inside with area.

Suppose x is the smallest side; then 5 would be the largest side, and it would be true that
x + 3 > 5
x > 2

Combine these: 2 < x < 8. That's the range of possible lengths of the third sides, and none of the three numbers given are in this range.

OA = (E)

Does all this make sense?
Mike :-)
_________________

Mike McGarry
Magoosh Test Prep


Education is not the filling of a pail, but the lighting of a fire. — William Butler Yeats (1865 – 1939)

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ABC is a triangle whose sides AB and BC have length of 3 and 5 respect  [#permalink]

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New post 18 Mar 2017, 10:05
None of the given lengths are correct since any two lengths of given triangle must be greater than Third Side.

Regards
Narayana Raju :P
GMAT Club Bot
ABC is a triangle whose sides AB and BC have length of 3 and 5 respect &nbs [#permalink] 18 Mar 2017, 10:05
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ABC is a triangle whose sides AB and BC have length of 3 and 5 respect

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