Question

how to do this please someone help both the no.

Answer 1

i) AC is a straight line.

Angle on a straight line is 180°.

3x+15+x+25=180

4x+40=180

4(x+10)=180

x+10=180/4

x+10=45

x=45-10

x=35

ii) x=35

Angle AOB=x+25

=35+25

=60°

iii) Angle BOC=3x+15

=3*35+15

105+15

=120°

Answer 2

In the same way, you can solve que.no. 4. just consider addition of all three angles as 180 degrees and equate them....
HOPE IT HELPS....