1. ANGLE PROPERTIES

2. Names of angles
ACUTE angles
angles between 0o and 90o
RIGHT angles
angles of 90o
OBTUSE angles
angles between 90o and 180o
REFLEX angles
angles greater than180o

3. right-angled triangle
Names of triangles
equilateral triangle
isosceles triangle
right-angled triangle
right-angled isosceles triangle
scalene
triangle

4. Angle properties
Angles on a straight line
Angles at a point
Vertically opposite angles

5. Angle properties
Angles in a triangle
Exterior angles of a
triangle
Angles in a quadrilateral

6. Parallel and perpendicular lines
Parallel lines
Perpendicular lines

7. Angle properties of parallel lines
Corresponding angles
Alternate angles
Interior angles

8. Examples
1 Calculate the size of each lettered angle.
opposite angles
angles on a straight line
opposite angles

9. Examples
2 Calculate the size of each lettered angle.
isosceles triangle
angles in a triangle

10. Examples
3 Calculate the size of angle a.
angles in a quadrilateral

11. Examples
4 Calculate the size of angle a.
corresponding angles

12. Examples
5 Calculate the size of angle a.
interior angles

13. Examples
6 Calculate the size of angle a.
alternate angles