Answer:
13) 790°
14) 945°
15) -890°
16) -360°
17) 890°
18) -220°
Explanation:
Please see the attached pictures.
Trace the lines and for every complete circle (4 quadrants), which I represented with a single colour, add 360°.
If it's just two quadrants, that's 180°.
One quadrant is 90°.
Some properties that might help:
- Adj ∠s on a straight line= 180°
- ∠s at a point= 360°
I've attached the maximum number of pictures so I can't draw on the questions anymore.
For question 18,
From 4th quadrant to 3rd quadrant, it is 180°.
The remaining value would be 90°-50°= 40°
Hence the measure of the angle is 180°+40°= 220°
If the angle moves clockwise from the starting point, it's a negative angle. That's why I added a minus sign for questions 15, 16 and 18.
Feel free to ask if you have any questions :)