• #### Same Side Interior and Same Side Exterior Angles - Problem 2

##### Math›Geometry›Reasoning, Diagonals, Angles and Parallel Lines
How to find missing same side interior and same side exterior angles.
• #### Same Side Interior and Same Side Exterior Angles - Concept

##### Math›Geometry›Reasoning, Diagonals, Angles and Parallel Lines
How to describe same side interior and same side exterior angles and their special properties.
• #### Angles in Semicircles and Chords to Tangents - Concept

##### Math›Geometry›Circles
How to prove that an angle inscribed in a semicircle is a right angle; how to solve for arcs and angles formed by a chord drawn to a point of tangency.
• #### The Double-Angle Formulas - Problem 2

How to derive a triple-angle formula for cosine.
• #### Exterior Angles of a Polygon - Problem 1

##### Math›Geometry›Polygons
How to find the measures of the three exterior angles of a triangle in terms of a variable.
• #### The Double-Angle Formulas - Problem 2

How to derive a triple-angle formula for cosine.
• #### Triangle Angle Sum - Concept

##### Math›Geometry›Triangles
How to apply the triangle angle sum theorem.
• #### Angles: Types and Labeling - Concept

##### Math›Geometry›Geometry Building Blocks
How to label an angle and how to differentiate between acute, right, obtuse, and straight angles.
• #### Polygon Angle Sum - Concept

##### Math›Geometry›Polygons
How to derive the formula to find the sum of angles in any polygon.
• #### Angles in Semicircles and Chords to Tangents - Problem 3

##### Math›Geometry›Circles
How to solve for arcs and angles formed by two chords drawn to a point of tangency.
• #### Duplicating an Angle - Problem 1

##### Math›Geometry›Constructions
How to duplicate an angle using a compass and straightedge.
• #### The Double-Angle Formulas - Problem 1

How to use the sine and cosine double-angle formulas to find sin(2a) and cos(2a) when sin(a) is known.
• #### The Double-Angle Formulas - Concept

How to use the sine and cosine addition formulas to prove the double-angle formulas.
• #### Duplicating an Angle - Concept

##### Math›Geometry›Constructions
How to duplicate an angle using a compass and straightedge.
• #### Angles in Semicircles and Chords to Tangents - Problem 1

##### Math›Geometry›Circles
How to find the missing angles in an angle inscribed in a semicircle.
• #### The Double-Angle Formulas - Concept

How to use the sine and cosine addition formulas to prove the double-angle formulas.
• #### The Double-Angle Formulas - Problem 1

How to use the sine and cosine double-angle formulas to find sin(2a) and cos(2a) when sin(a) is known.
• #### Angles - Problem 1

##### Math›Pre-Algebra›Introductory Geometry
Name an angle with letters and classify the angles based on the degree measure
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