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January 25, 2015

January 25, 2015

Posted by **vincent** on Saturday, August 3, 2013 at 10:46am.

- math -
**Steve**, Saturday, August 3, 2013 at 2:19pmsince the two base angles are equal, if each is x, then

x+30 + x + x = 180

3x = 150

x = 50

So, the vertex angle is 80

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