1.

This answer math chapter is 6 ​

Answer»

These three ANGLES are on STARIGHT line

and we KNOW the angle of straight line=180°

ATQ

x+65°+2x-20=180°

3x+45=180

3x=180-45

3x=135

x=45

So

First angle=45°

Second angle=65°

Third angle=2×45-20=70°

Alternative method was (LINEAR pair)


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