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Angles in a straight line and around a point

Angles in a straight line and around a point. Lesson Objectives. To understand the sum of angles in a straight line To understand the sum of angles around a point To be able to answer questions by using these two rule to find unknown angles. What angle is this?. =90 ° A right-angle.

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Angles in a straight line and around a point

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  1. Angles in a straight line and around a point

  2. Lesson Objectives • To understand the sum of angles in a straight line • To understand the sum of angles around a point • To be able to answer questions by using these two rule to find unknown angles.

  3. What angle is this? =90° A right-angle

  4. If there are 90° in a right-angle, how many are their in a straight line? 90° 90° 90°+90°= 180°

  5. As there are 180° in a straight line, what is the unknown angle here? ? 135° 45° 180°- 45° = 135°

  6. 90° 90° 90° 90° If the angles in a straight line equal 180°, what do the angles around a point add up to? 90°+90°+90°+90°= 360°

  7. As there are 360° around a point, what is the unknown angle here? 60° 45° 45° 100° ? 110° 360° - 45° - 60° - 45° - 100° = 110°

  8. ? 45° 180°- 45° = 135° 60° 45° 45° 100° ? 360° - 45° - 60° - 45° - 100° = 110° Copy out the following definitions: Angles in a straight line = 180° Angles around a point = 360°

  9. PlenaryWhat are the missing angles? 57° 123° a 89° b 46° 45°

  10. What are the missing angles? 150° 30° X Z 30° Y 150°

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