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# Using a protractor

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### Using a protractor

1. 1. 4210011 0010 1010 1101 0001 0100 1011Measuring, calculating anddrawing angles...Our learning objectives todayTo use a protractor to:a) measure acute and obtuse angles to the nearestdegree.b) draw acute and obtuse angles to the nearestdegree.To calculate angles on a straight line.
2. 2. 4210011 0010 1010 1101 0001 0100 1011What do we use to help us?A protractorHere is a standard protractor like youuse in the classroom.
3. 3. 4210011 0010 1010 1101 0001 0100 1011When we use a protractor, weneed to line it up correctly.You need to make sure the protractor is lined up correctly.Is this ready to measure the angle?
4. 4. 4210011 0010 1010 1101 0001 0100 1011Were you right......................it wasn’tLook for the upside down ‘T’ in the middle ofthe straight line on your protractor.This needs to be exactly on the vertex ofyour angle.
5. 5. 4210011 0010 1010 1101 0001 0100 1011We need to remember.....It doesn’tmatter whichway round theangle is, youALWAYS needto line the upsidedown ‘T’ to the vertexof the angle.
6. 6. 4210011 0010 1010 1101 0001 0100 1011Now you are ready.Read from the 0°, and follow the inner set ofnumbers.
7. 7. 4210011 0010 1010 1101 0001 0100 1011Once you reach 30° you need to becareful!!!You then need to look at the 1° markings onthe outer set of numbers.
8. 8. 4210011 0010 1010 1101 0001 0100 1011What does it measure?This angle measures 35°.
9. 9. 4210011 0010 1010 1101 0001 0100 1011Measuring, calculating anddrawing angles...Remember our learning objectivestoday areTo use a protractor to:a) measure acute and obtuse angles to the nearestdegree.b) draw acute and obtuse angles to the nearestdegree.To calculate angles on a straight line.

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