In this lesson, students solve for unknown angles in word problems and in diagrams involving all learned angle facts.

In this lesson, students solve for unknown angles in word problems and in diagrams involving complementary and supplementary angles.

In this lesson, students solve for unknown angles in word problems and in diagrams involving complementary, supplementary, vertical, and adjacent angles.

An interactive applet and associated web page that demonstrate supplementary angles (two angles that add to 180 degrees.) The applet shows two angles which, while not adjacent, are drawn to strongly suggest visually that they add to a straight angle. Any point defining the angle scan be dragged, and as you do so, the other angle changes to remain supplementary to the one you change. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

In this lesson, students use facts about supplementary, complementary, vertical, and adjacent angles in a multi-step problem to write and solve simple equations for an unknown angle in a figure.

In this lesson, students use vertical and adjacent angles and angles on a line and angles at a point in a multi-step problem to write and solve simple equations for an unknown angle in a figure.