When part of an original figure matches up with part of a copy, we call them corresponding parts. These could be points, segments, angles, or distances. For example, point in the first triangle corresponds to point in the second triangle. Segment corresponds to segment .

What does it mean to have corresponding points?

: points on the retinas of the two eyes which when simultaneously stimulated normally produce a single visual impression.

What are corresponding parts of polygons?

Corresponding sides of a polygon are the sides that are in the same position in similar polygons. In geometry, finding the congruence and similarity involves comparing corresponding sides and corresponding angles of the polygons.

They see that when two figures are scaled copies of one another, the same scale factor relates their corresponding lengths. Students use tracing paper to trace and compare angles in an original figure and its copies. They observe that in scaled copies the measures of corresponding angles are equal.