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705-805 (Hard)|   Geometry|      
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mikemcgarry
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Point P is a point inside triangle ABC. Is triangle ABC equilateral? 24 May 2016, 15:08
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

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85% (hard)

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38% (01:30) correct 62% (01:20) wrong based on 401 sessions

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Triangle with interior point.png
Triangle with interior point.png [ 5.28 KiB | Viewed 12387 times ]

Point P is a point inside triangle ABC. Is triangle ABC equilateral?

Statement #1: Point P is equidistant from the three vertices A, B, and C.

Statement #2: Triangle ABC has two different lines of symmetry that pass through point P.

Geometry is a beautiful topic! This question comes from a bank of 10 DS practice questions on Geometry. To see the others as well as the OE for this particular question, see:
GMAT Data Sufficiency Geometry Practice Questions

Mike :-)
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Point P is a point inside triangle ABC. Is triangle ABC equilateral? 24 May 2016, 19:12
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mikemcgarry
Attachment:
Triangle with interior point.png

Point P is a point inside triangle ABC. Is triangle ABC equilateral?

Statement #1: Point P is equidistant from the three vertices A, B, and C.

Statement #2: Triangle ABC has two different lines of symmetry that pass through point P.

Geometry is a beautiful topic! This question comes from a bank of 10 DS practice questions on Geometry. To see the others as well as the OE for this particular question, see:
GMAT Data Sufficiency Geometry Practice Questions

Mike :-)
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Hi,

lets see the statements-


Statement #1: Point P is equidistant from the three vertices A, B, and C.
This is same as THREE points on a circle and point P is the CENTER of the circle...
here we can have various combination of picking 3 points on circle and most will not make an equilateral triangle..
ans can be YES and NO both..
Insuff

Statement #2: Triangle ABC has two different lines of symmetry that pass through point P.
for symmetry, the line has to pass through one vertice and the center of opposite side...
Only 1 such line would most likely make an isosceles triangle, BUT two such lines will happen only in equilateral triangle..
Suff

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Point P is a point inside triangle ABC. Is triangle ABC equilateral? 13 Dec 2018, 00:49
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Debashis Roy
@chetan2uHi@ chetan2u can you please elaborate this statement:

Statement #2: Triangle ABC has two different lines of symmetry that pass through point P.
for symmetry, the line has to pass through one vertice and the center of opposite side...
Only 1 such line would most likely make an isosceles triangle, BUT two such lines will happen only in equilateral triangle..

Thanks in advance
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Line of symmetry means the line that will result in a mirror image on either side...
so for an isosceles triangle, there will be only one line of symmetry as shown in the figure. One line of symmetry would mean any two angles equal

However only for equilateral it will be more than 1, as it would mean angle A= B, and B=C, which would mean A=B=C so all angles equal.
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Point P is a point inside triangle ABC. Is triangle ABC equilateral? 17 Nov 2018, 04:13
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Do we need to know what lines of symmetry means? Never heard that term before in any gmat geometry question
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Point P is a point inside triangle ABC. Is triangle ABC equilateral? 13 Dec 2018, 00:23
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@chetan2uHi@ chetan2u can you please elaborate this statement:

Statement #2: Triangle ABC has two different lines of symmetry that pass through point P.
for symmetry, the line has to pass through one vertice and the center of opposite side...
Only 1 such line would most likely make an isosceles triangle, BUT two such lines will happen only in equilateral triangle..

Thanks in advance
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Debashis Roy
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Point P is a point inside triangle ABC. Is triangle ABC equilateral? 13 Dec 2018, 01:03
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chetan2u Yeah I got it. Thanks.

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Point P is a point inside triangle ABC. Is triangle ABC equilateral? 10 Jan 2024, 21:02
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