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

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In isosceles triangle RST what is the measure of angle R? 1) [#permalink] New post 27 May 2006, 14:15
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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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 [#permalink] New post 28 May 2006, 10:48
IMO,,, D

Sum of the algle have to be 180'
and 2 angle have to be same...
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 [#permalink] New post 01 Jun 2006, 14:48
(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
  [#permalink] 01 Jun 2006, 14:48
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In isosceles triangle RST what is the measure of angle R? 1)

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