Understanding Angles: Types and Measurements in Geometry

1. Angles 1 – What is an angle? Tandi Clausen-May Teaching Maths to Pupils with Different Learning StylesLondon: Paul Chapman, 2005 Click the mouse only when you see ‘Click the mouse’ . Otherwise you will miss some of the dynamic bits. Click the mouse.

2. a n g l e An angle is a measure of turn. Click the mouse.

3. A whole turn. Click the mouse to see a whole turn. Click the mouse.

4. A half turn. Click the mouse to see a half turn. Click the mouse.

5. A quarter turn. Click the mouse to see a quarter turn. Click the mouse.

6. A quarter turn is a right angle. Click the mouse to see a quarter turn right angle. Click the mouse.

7. A half turn is a straight angle. Click the mouse to see a half turn straight angle. Click the mouse.

8. A three quarter turn is one size of reflex angle. Click the mouse to see a three quarter turn reflex angle. Click the mouse.

9. An acute angle is less than a quarter turn. For example, a one sixth turn is an acute angle. Click the mouse to see a one sixth turn acute angle. Click the mouse.

10. An obtuse angle is more than a quarter turn, but less than a half turn. For example, a one third turn is an obtuse angle. Click the mouse to see a one third turn obtuse angle. Click the mouse.

11. A reflex angle is more than a half turn. For example, a two thirds turn is a reflex angle. Click the mouse to see a two thirds turn reflex angle. Click the mouse.

12. Now watch Angles 2 – Measuring angles