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# Angles in a right angle and straight line

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### Angles in a right angle and straight line

1. 1. Entry Activity – Find a) 90 – 50 =  h)90 - = 10b)90 – 40 =  i) 180 - = 50c) 180 – 100 =  j) 90 - = 80d)180 – 55 =  k) 180 - = 150e) 90 – 18 =  l) 90 - = 15f) 90 – 32 =  m)180 - = 32g) 180 – 48 =  n)90 - = 47
2. 2. Entry Activity – Find a) 90 – 50 =  h)90 - = 10b)90 – 40 =  i) 180 - = 50c) 180 – 100 =  j) 90 - = 80d)180 – 55 =  k) 180 - = 150e) 90 – 18 =  l) 90 - = 15f) 90 – 32 =  m)180 - = 32g) 180 – 48 =  n)90 - = 47
3. 3. Today I will learn to identify the number ofdegrees in right-angles, on a straight line andround a point Level 4+Challenge Objective: To solve problems relatingto angles in a right-angle, on a straight line andround a point Level 5 Key Words • Angle • Degree • Right-angle • Straight-line
4. 4. Today I will learn to identify the number of degrees in right-angles and on a straight line Level 4 Reflex angle More than 90˚ but less than 180˚ Less than 90˚ Right-angle Straight-line 180˚ 90˚ More than180˚ Obtuse angle Acute angle
5. 5. Today I will learn to identify the number of degrees in right-angles and on a straight line Level 4 90˚ Straight-line 180˚ Right-angle More than 180˚ Less than 90˚ Reflex angle Obtuse angleAcute angle More than 90˚ but less than 180˚
6. 6. To solve problems relating to angles in aright-angle and on a straight line Level 5
7. 7. To solve problems relating to angles in aright-angle and on a straight line Level 5 5˚ 40˚ 70˚ 10˚ 41˚ 45˚ 52˚ 35˚
8. 8. To solve problems relating to angles in aright-angle and on a straight line Level 5
9. 9. To solve problems relating to angles in aright-angle and on a straight line Level 5 100˚ 60˚ 125˚ 80˚ 102˚ 25˚ 95˚ 112˚ 66˚
10. 10. Today I will learn to identify the number ofdegrees in right-angles, on a straight line andround a point Level 4+Challenge Objective: To solve problems relatingto angles in a right-angle, on a straight line andround a point Level 5 Key Words • Angle • Degree • Right-angle • Straight-line
11. 11. Level 5Extension
12. 12. Today I will learn to identify the number ofdegrees in right-angles, on a straight line andround a point Level 4+Challenge Objective: To solve problems relatingto angles in a right-angle, on a straight line andround a point Level 5 Key Words • Angle • Degree • Right-angle • Straight-line
13. 13. To calculate angles round a point Level 5
14. 14. To calculate angles round a point Level 5
15. 15. To calculate angles round a point Level 5 Extension
16. 16. I can identify the number of degrees in right-angles Level 4I can identify the number of degrees on a straight line Level 4I can identify the number of degrees round a point Level 4I can solve problems relating to angles in a right-angle Level 5I can solve problems relating to angles on a straight line Level 5I can solve problems relating to angles round a point Level 5