Angles are taken to angles of the same measure

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8.G.A.1.b

**8.G.A.1**: Verify experimentally the properties of rotations, reflections, and translations: **8.G.A.1.b**: Angles are taken to angles of the same measure.

8.G.A.1: Verify experimentally the properties of rotations, reflections, and translations:
8.G.A.1.b: Angles are taken to angles of the same measure.

What you'll learn

Verify experimentally that translating an angle produces an image angle with the same degree measure as the original
Verify experimentally that reflecting an angle across a line produces an image angle with the same degree measure as the original
Verify experimentally that rotating an angle about a point produces an image angle with the same degree measure as the original
Explain why angle preservation is a defining property of rigid motions and contrast this with non-rigid transformations that change angle measure
Apply the angle-preservation property to determine unknown angle measures in figures that have been transformed by a sequence of rigid motions

Review first:

Verify experimentally the properties of rotations, reflections, and translations

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Angles preserved

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Exercise

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