SOLUTION: the second angle of a triangle is twice the first angle. the third angle is 20 degrees more than the first angle. find the first angle.

Algebra ->  Triangles -> SOLUTION: the second angle of a triangle is twice the first angle. the third angle is 20 degrees more than the first angle. find the first angle.      Log On


   

Question 315216: the second angle of a triangle is twice the first angle. the third angle is 20 degrees more than the first angle. find the first angle.
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
X+2X+X+20=180
4X=180-20
4X=160
X=160/4
X=40 DEGREES FOR THE FIRST ANGLE.
2X=2*40=80 DEGREES FOR THE SECOND ANGLE.
40+20=60 DEGREES FOR THE THIRD ANGLE.
PROOF:
40+80+60=180
180=180