Step 1 - Put the midpoint of the protractor on the vertex of the angle you are measuring, Step 2 - Line up one arm of the angle with the zero line of the protractor, Step 3 - Check: on which scale does the arm go through zero?, Step 4 - Look at where the other arm goes through the scale. , Step 5 - Write down the angle, Step 6 - Is it reasonable? does the measurement fall in the range for the type of angle that has been drawn?,

Using a Protractor to Measure Angles

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