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Positive angles are the angles made by rotating counter clockwise whereas negative angles are made by rotating anti clockwise.

-30° can also be written as 360° - 30° = 330°

1) Find angle P

Answer: Angle on a straight line is 180°

P + 20° + P + P + 10° = 180°

3P + 30° = 180°

3P = 150°

P =50°

2) Find < Q

Answer:

P + Q = 180°

25° + Q = 180°

Q = 155°