Geometry Archive

Lines are taken to lines, and line segments to line segments of the same length.

Angles are taken to angles of the same measure.

Parallel lines are taken to parallel lines.

Understand that a two-dimensional figure is congruent to another if the second can be obtained from the first by…

Describe the effect of dilations, translations, rotations and reflections on two-dimensional figures using coordinates.

Understand that a two-dimensional figure is similar to another if the second can be obtained from the first by…

Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created…

Explain a proof of the Pythagorean Theorem and its converse.