. Grade 4, Illustrative icon

Measuring Angles

Illustrative MathematicsVaries

The purpose of this task is to gain experience drawing and measuring angles, developing an understanding of the additive structure of angles. This task gives good practice with MP.5, Use Appropriate Tools Strategically, as a protractor should be used to construct the angles. Since the protractor is not an exact instrument, students will not necessarily obtain the mathematically derived answers in the solution (35 degrees and 85 degrees). They should, however, find answers very close to these and, with their understanding of the additive nature of angles, know what the exact answer should be even if their drawings or measurements were not exact.

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