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Protractor powerpoint

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Protractor usage

Protractor usage

Published in: Education, Business, Technology

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Transcript

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