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# Using a protractor

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How to use a protractor to read angles

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### Using a protractor

1. 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. 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. 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. 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. 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. 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. 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. 8. What does it measure?0011 0010 1010 1101 0001 0100 1011 1 2 This angle measures 35°. 4
9. 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.