Homework Help: geometry

Posted by jessie on Friday, February 15, 2013 at 10:57pm.

If you had a Iscocles triangle bca and the vertex c was 21y+13 and <b was 6y+1 would <a be congruent to <b since it states that they are congruent? and what would angle a be and what would y equal???
please help either I am thinking to hard or Im stupid lol :)

geometry - Reiny, Friday, February 15, 2013 at 11:15pm
I will assume in your triangle , angle A = angle B

so 21y+13 + 6y+1 + 6y+1 = 180
33y = 165
y = 5

then angle A = 31° , angle B = 31° and angle C = 118°

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