• #### Polygon Angle Sum - Problem 1

##### Math›Geometry›Polygons
How to find the sum of the angles when you know the number of sides of a polygon.
• #### Polygon Angle Sum - Problem 2

##### Math›Geometry›Polygons
How to find the number of sides of a polygon when you know the sum of its angles.
• #### Polygon Angle Sum - Problem 3

##### Math›Geometry›Polygons
How to apply the polygon angle sum theorem when you need to solve for x.
• #### Angle of Elevation and Depression - Problem 1

##### Math›Geometry›Basic Trigonometry
How to use an angle of depression to solve a word problem with an airplane.
• #### Angle of Elevation and Depression - Problem 1

##### Math›Trigonometry›Basic Trigonometry
How to use an angle of depression to solve a word problem with an airplane.
• #### Triangle Angle Sum - Problem 2

##### Math›Geometry›Triangles
How to apply the triangle angle sum theorem when you need to solve for x.
• #### Triangle Side and Angle Inequalities - Concept

##### Math›Geometry›Triangles
How to determine the relationship between the side inequalities and angle inequalities in a triangle.
• #### Radian Measure of Angles - Problem 1

##### Math›Trigonometry›Trigonometric Functions
How to measure a central angle of a circle when the radius and the length of the intercepted arc are given.
• #### Angle Bisectors and Opposite Side Ratios - Concept

##### Math›Geometry›Similarity
How to relate the sides of an angle bisected and the lengths of the opposite side.
• #### Triangle Side and Angle Inequalities - Problem 2

##### Math›Geometry›Triangles
How to list the sides of a triangle from longest to shortest given the measures of the interior angles.
• #### The Half-Angle Identities - Concept

How to use the power reduction formulas to derive the half-angle formulas.
• #### The Half-Angle Identities - Problem 1

How to use a half-angle formula to evaluate sin(/8).
• #### Central Angles and Intercepted Arcs - Problem 1

##### Math›Geometry›Circles
How to find arc measures, given the measure of its central angle measure, or find central angle measures, given congruent chords.
• #### Angle Inclination of a Line - Problem 1

How to find the angle of inclination of a line.
• #### The Half-Angle Identities - Problem 2

How to use a half-angle formula to evaluate cos(105).
• #### Angle Inclination of a Line - Problem 3

How to find the angle of inclination of a line.