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Using a protractor
- 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 weuse 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 usea 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......................itwasn’t 0011 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 toremember..... 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 areready. 0011 0010 1010 1101 0001 0100 1011 1 2 4 Read from the 0°, and follow the inner set of numbers.
- 7. Once you reach30° 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 itmeasure? 0011 0010 1010 1101 0001 0100 1011 1 2 This angle measures 35°. 4
- 9. Measuring, calculating and drawing angles... Remember our learning objectives 0011 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.