What's Your Angle?
Measurement
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Objective
Using inductive reasoning, students will devise procedures for using a protractor to
measure the number of degrees in an angle.
Overview of the Lesson
Students make estimates of the measurement of various angles created with angle wheels.
They use quarter rotations and half rotations as points of reference. The angle wheels are
used to create visual images of the sizes of various angles. Later, the protractor is
introduced as a tool commonly used to measure the size of angles except, the students are
not told how to use it. By applying a special technique using a hinged mirror, students
determine the number of degrees in several angles which are printed on a worksheet.
Since they now know the measurement of these angles, they use inductive reasoning
skills to construct their own method for effectively using the protractor to measure angles.
