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# In isosceles triangle RST what is the measure of angle R? 1)

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Intern
Joined: 08 Sep 2005
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In isosceles triangle RST what is the measure of angle R? 1) [#permalink]

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27 May 2006, 15:15
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In isosceles triangle RST what is the measure of angle R?

1) The measure of angle T is 100
2) The measure of angle S is 40

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Manager
Joined: 27 Jan 2006
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Location: Europe

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28 May 2006, 11:48
IMO,,, D

Sum of the algle have to be 180'
and 2 angle have to be same...
_________________

Stay hungry, Stay foolish

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SVP
Joined: 01 May 2006
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01 Jun 2006, 15:48
(A) aslo

from (1), an isoceles triangle: 2 angles have to be equal. In addition, they have to be less than 90.
As T=100, thus R=S= (180-100)/2 = 40
Sufficient

from (2), S=40 but is it S=R or S=T ? We cannot conclude.
Insufficient

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01 Jun 2006, 15:48
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