1. © T Madas 180 10 20 170 0 160 30 150 40 140 50 130 60 120 70 110 80 100 90 180 170 160 140 150 130 120 110 100 80 70 60 50 40 30 20 10 0

2. © T Madas What is a right angle? Quarter turn Right angle Half turn Straight line 2 Right angles Three quarter turn Full turn

3. © T Madas T y p e s o f A n g l e s Acute angle Right angle Obtuse angle Straight angle Reflex angle

4. © T Madas 180 10 20 170 0 160 30 150 40 140 50 130 60 120 70 110 80 100 90 180 170 160 140 150 130 120 110 100 80 70 60 50 40 30 20 10 0 What do we use for measuring angles? In what units does it measure angles? Why does it have a double scale? Protractor Degrees, °

5. © T Madas 180 10 20 170 0 160 30 150 40 140 50 130 60 120 70 110 80 100 90 180 170 160 140 150 130 120 110 100 80 70 60 50 40 30 20 10 0 What type of angle is it? Acute angle Less than 90° 40°

6. © T Madas What type of angle is it? Obtuse angle greater than 90° 120° 180 10 20 170 0 160 30 150 40 140 50 130 60 120 70 110 80 100 90 180 170 160 140 150 130 120 110 100 80 70 60 50 40 30 20 10 0

7. © T Madas

8. Estimate the following angles 36° 95° 65° 25° 127° 46° 108° 167°

9. © T Madas 41° 85° 56° 16° 136° 46° 96° 178° Estimate the following angles

10. © T Madas 319° 275° 304° 344° 225° 316° 265° 185° Estimate the following angles

11. © T Madas

12. Estimate the following angles 36° 95° 65° 25° 127° 46° 108° 167°

13. © T Madas 41° 85° 56° 16° 136° 46° 96° 178° Estimate the following angles

14. © T Madas 319° 275° 304° 344° 225° 316° 265° 185° Estimate the following angles

15. © T Madas