Exercises: Measuring and Sketching Angles Using a Protractor
Work through each section in order. Before you trust a scale reading, always classify
the angle by eye first -- acute, right, or obtuse -- and check that your reading agrees.
Recall / Warm-Up
These problems review skills from earlier lessons that this lesson depends on.
A protractor is shaped like a half circle. A full circle is 360 degrees. How many degrees does the protractor's half circle cover?
Fluency Practice
A protractor's baseline lies along one ray of an angle. That ray sits at 0 degrees on the inner scale and 180 degrees on the outer scale. The second ray crosses the inner scale at 55 and the outer scale at 125. What is the angle's measure?
A protractor's baseline lies along one ray of an angle. That ray sits at 0 degrees on the outer scale this time. The second ray crosses the inner scale at 40 and the outer scale at 140. What is the angle's measure?
An angle's baseline ray reads 0 degrees on the inner scale. The second ray crosses the inner scale at 75 degrees. What is the angle's measure?
An angle's baseline ray reads 0 degrees on the inner scale. The second ray crosses the inner scale at 150 and the outer scale at 30. The angle looks obtuse when you look at it. Which reading is correct?
You are sketching a 65-degree angle. After drawing the first ray and aligning the protractor's baseline along it, on which scale value (using the scale that reads 0 along the baseline) do you mark your dot?
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