A series of 18 screens that contain diagrams about basic angle facts. Students have to annotate the screens with key results. Spelling error c

1. Names for angles
< 90 = 90
90 < a < 180
180 < a < 360

2. Compass points and bearings
North
000
West East
270 090
South
180

3. Angles at a point

4. Angles on a line

5. Complementary angles

6. Opposite angles

7. Parallel lines: Corresponding angles

8. Parallel lines: Alternate angles

9. Parallel lines: Allied angles

10. Angles in a triangle

11. Named triangles...

12. Angles in a quadrilateral

13. Named quadrilaterals

14. Interior and exterior angles
Also called external and internal angles

15. Polygons
Triangle
Rectangle
Irregular
Pentagon
Hexagon
Heptagon
Octagon
Nonagon
Regular Decagon

16. Exterior angles of a polygon
Regular
Irregular
e
e = 360
n
Exterior angles Exterior angle
add to 360 must be factor
of 360

17. Interior angles of a polygon
Regular
i
e
(n – 2) ×180
Total i=
internal = (n – 2) ×180 n
angle
i = 180 - e

18. Circle angles