Angles

Sort by:
An animated demonstration showing how to use a protractor to draw an angle

How to copy a triangle with compass and straightedge

Congruent triangles - all three sides equal. SSS

Congruent triangles - Why SSA does not work

Congruent triangles - Two sides and included angle. SAS

Polygons are congruent when all corresponding sides and interior angles are congruent.

Definition and properties of the inscribed angle of a circle

Definition and properties of vertical (or opposite) angles

Definition and properties of supplementary angles - two angles that add to 180 degrees

Definition and properties of the interior angles of a transversal

< Previous 1 1 . 2 2 . 3 3 . 4 4 . 5 5 . 6 . 7 7 . 8 8 . 9 9 Next >