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DS - isoscel triangle angle

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Xbond: Master | Next Rank: 500 Posts; Posts: 275; Joined: Wed Jul 02, 2008 4:19 am; Thanked: 4 times

by Xbond » Fri Sep 11, 2009 10:59 am

Hi there,

Could you give me your ELEGANT, QUICK, and EFFICIENT method to resolve (with these concepts and with finding the solution).

In isosceles triangle RST what is the measure of angle R?
1) The measure of angle T is 100Â°.
2) The measure of angles is 40Â°.

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Source: Beat The GMAT — Data Sufficiency | Fri Sep 11, 2009 10:59 am

g1988enator: Newbie | Next Rank: 10 Posts; Posts: 9; Joined: Fri Sep 11, 2009 10:56 am; Location: delhi

by g1988enator » Fri Sep 11, 2009 11:22 am

sum of angle of triangle is 180.
if t is 100 so other 2 have 2 be 40 degree since it's a isosceles triangle so 1 statement is sufficent enough .
but 2 condition is not enough as angles can be 40 40 100 or 40 70 70

1 statemnt is enough

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Xbond: Master | Next Rank: 500 Posts; Posts: 275; Joined: Wed Jul 02, 2008 4:19 am; Thanked: 4 times

by Xbond » Mon Sep 14, 2009 12:48 am

many thks

OA is A

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