The measure of each angle of angle ABC is equal to the corresponding angle of angle A' B' C' when angle A' B' C' coincides with the other three triangles. The measures of the angles of the triangle are preserved as the figure rotates.
The angle measures of ABC and the other triangles are the same measures, and the side lengths in ABC and the other triangles are the same lengths when ABC coincides with them. It appears that angle measures and side lengths are both preserved when ABC is rotated.
An angle measure in geometry is the length of the angle created by two rays or arms meeting at a common vertex. Using a protractor, angles are measured in degrees (°). Fun facts Joseph Huddart created the protractor in 1801. It was a more advanced protractor.
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