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Using a protractor

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How to use a protractor to read angles

How to use a protractor to read angles

Published in: Education, Business

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  • 1. Measuring, calculating and drawing angles...0011 0010 1010 1101 0001 0100 1011 Our learning objectives today 1 2 To use a protractor to: d) measure acute and obtuse angles to the nearest 4 degree. e) draw acute and obtuse angles to the nearest degree. To calculate angles on a straight line.
  • 2. What do we use to help us?0011 0010 1010 1101 0001 0100 1011 A protractor 1 2 4 Here is a standard protractor like you use in the classroom.
  • 3. When we use a protractor, we need to line it up correctly.0011 0010 1010 1101 0001 0100 1011 1 2 4 You need to make sure the protractor is lined up correctly. Is this ready to measure the angle?
  • 4. Were you right......................it wasn’t0011 0010 1010 1101 0001 0100 1011 1 2 4 Look for the upside down ‘T’ in the middle of the straight line on your protractor. This needs to be exactly on the vertex of your angle.
  • 5. We need to remember.....0011 0010 1010 1101 0001 0100 1011 2 It doesn’t 1 matter which way round the 4 angle is, you ALWAYS need to line the upside down ‘T’ to the vertex of the angle.
  • 6. Now you are ready.0011 0010 1010 1101 0001 0100 1011 1 2 4 Read from the 0°, and follow the inner set of numbers.
  • 7. Once you reach 30° you need to be careful!!!0011 0010 1010 1101 0001 0100 1011 1 2 4 You then need to look at the 1° markings on the outer set of numbers.
  • 8. What does it measure?0011 0010 1010 1101 0001 0100 1011 1 2 This angle measures 35°. 4
  • 9. Measuring, calculating and drawing angles... Remember our learning objectives0011 0010 1010 1101 0001 0100 1011 today are 1 2 To use a protractor to: d) measure acute and obtuse angles to the nearest 4 degree. e) draw acute and obtuse angles to the nearest degree. To calculate angles on a straight line.