• #### The Definitions of Sine and Cosine - Concept

##### Math›Precalculus›Trigonometric Functions
How we define sine and cosine for all angle measures using the unit circle.
• #### Parallel and Perpendicular Lines - Concept

##### Math›Algebra›Linear Equations and Their Graphs
How to determine whether lines are parallel, perpendicular, or neither.
• #### Radii to Tangents - Problem 3

##### Math›Geometry›Circles
How to calculate the length of a segment drawn from the center of a circle to a point outside the circle, given the length of the tangent segment to that circle.
• #### Parallel and Perpendicular Lines - Problem 2

##### Math›Algebra›Linear Equations and Their Graphs
How to write the equation of a line perpendicular to a given line through a given point.
• #### Parallel and Perpendicular Lines - Problem 3

##### Math›Algebra›Linear Equations and Their Graphs
How to write the equation of a line perpendicular to a given line that is not in slope intercept form.
• #### Area of a Segment - Problem 1

##### Math›Geometry›Area
How to find the area of a segment, given a leg in a right triangle.
• #### Inverse Trigonometric Functions - Problem 2

##### Math›Geometry›Basic Trigonometry
How to use inverse trig functions to find an angle in a trapezoid.
• #### The Tangent Function - Concept

##### Math›Trigonometry›Trigonometric Functions
How to define the tangent function for all angles.
• #### Trigonometric Ratios: Sine - Problem 2

##### Math›Trigonometry›Basic Trigonometry
How to find the length of a base in an isosceles triangle given the vertex angle and a leg length.
• #### Trigonometric Ratios: Sine - Problem 2

##### Math›Precalculus›Basic Trigonometry
How to find the length of a base in an isosceles triangle given the vertex angle and a leg length.
• #### Trigonometric Ratios: Sine - Problem 2

##### Math›Geometry›Basic Trigonometry
How to find the length of a base in an isosceles triangle given the vertex angle and a leg length.
• #### Inverse Trigonometric Functions - Problem 2

##### Math›Precalculus›Basic Trigonometry
How to use inverse trig functions to find an angle in a trapezoid.
• #### Types of Triangles - Concept

##### Math›Geometry›Geometry Building Blocks
How to classify a triangle based on its side lengths and angle measures.
• #### Inverse Trigonometric Functions - Problem 2

##### Math›Trigonometry›Basic Trigonometry
How to use inverse trig functions to find an angle in a trapezoid.
• #### The Tangent Function - Concept

##### Math›Precalculus›Trigonometric Functions
How to define the tangent function for all angles.