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In this video from MPT, learn how sculptor Mary Ann Mears uses angle measurement and geometric relationships when determining angles in scale models. In the accompanying classroom activity, students apply what they learn in the video as they solve problems in which they are given clues about two of the angles in a triangle and must determine the third. Clues involve measurements of interior and exterior angles in the triangle. To get the most from the lesson, students should be familiar with the concept of scale models. For a longer self-paced student tutorial using this media, see "Mapping Out Sculptures" on *Thinkport* from Maryland Public Television.

This resource is part of the *Math at the Core: Middle School* collection.

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