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 ->  Rectangles -> 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 123954: 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 checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
X+2X+(X+20)=90
4X+20=90
4X=90-20
4X=70
X=70/4
X=17.5 DEGREES FOR THE FIRST ANGLE.
2*17.5=35 FOR THE SECOND ANGLE.
17.5+20=37.5 FOR THE THIRD ANGLE.
PROOF:
17.5+35+37.5=90
90=90