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A 180o Protractor
Outside scale from0o to 180o going in aclockwise direction.
Inside scale from0o to 180o going in ananti-clockwise direction.
You need to be able to measure an angle to the nearestdegree. To help you do this you should always:
1. Look directly down onto the cross point to improve accuracy.
2. Always use the protractor in a horizontal manner as shownbelow.
1
2
MeasuringAngles with a180o Protractor
0 on the outside souse outside scale
0 on the inside souse inside scale
67o
50o
3
4
MeasuringAngles with a180o Protractor
0 on the outside souse outside scale
0 on the inside souse inside scale
135o
120o
Measure each angle in the shapes below.
1
2
3
4
5
6
900
900
900
900
1120
1120
680
680
670
670
460
730
730
1070
1070
900
420
480
1100
1100
1010
1010
1180
Rectangle 3600
Trapezium 3600
Triangle 1800
Parallelogram 3600
Pentagon 5400
Triangle 1800
Estimating Angles
1
2
3
4
5
6
2
1
3
4
Measure each angle in the shapes below.
1
2
3
4
5
6