Homework Help: math

Posted by Robin on Tuesday, January 12, 2010 at 11:47pm.

the second angle of the a triangle is twice as large as the first angle. the measure of the third angle is 20 degrees less than the second. how large is each angle?

math - drwls, Tuesday, January 12, 2010 at 11:57pm
First angle = A
second angle = B
Third angle = 3
A + B + C = 180
B = 2A
C = B - 20

B/2 + B + (B-20) = 180
5/2 B = 200
B = (2/5)*200 = 80
You finish it.
math - timmy, Tuesday, January 12, 2010 at 11:58pm
40 degrees 60 degrees and 80 degrees

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