# right triangle definitions of sine and cosine   212 videos

• #### Constructing a Triangle Midsegment

##### GeometryConstructions

How to define a midsegment in a triangle.

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• #### Using the Pythagorean Theorem to find a Missing Hypotenuse

##### GeometryPythagorean Theorem

How to calculate the hypotenuse in a right triangle given the lengths of the legs using the Pythagorean Theorem.

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• #### Using the Pythagorean Theorem to find a Missing Hypotenuse

##### TrigonometryPythagorean Theorem

How to calculate the hypotenuse in a right triangle given the lengths of the legs using the Pythagorean Theorem.

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• #### Isosceles Triangles

##### GeometryTriangles

How to define isosceles triangles, their components and how to determine their properties.

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• #### Triangle Side Inequalities

##### GeometryTriangles

How to determine the triangle side inequalities.

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• #### Triangle Side and Angle Inequalities

##### GeometryTriangles

How to determine the relationship between the side inequalities and angle inequalities in a triangle.

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• #### Area and Perimeter of Triangles

##### Pre-AlgebraIntroductory Geometry

Understanding why the area of a triangle is 1/2 base times height

• #### Counterexample

##### GeometryGeometry Building Blocks

How to use a counterexample to prove a definition or conjecture incorrect.

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• #### Definite Integrals As Net Change

##### CalculusThe Definite Integral

How to use the fundamental theorem of calculus to compute the net change of a quantity.

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• #### Similar Triangles

##### Pre-AlgebraIntroductory Geometry

Overview of similarity: congruent angles, proportional corresponding sides

• #### Definition of Slope

##### AlgebraLinear Equations and Their Graphs

How to understand the idea of slope.

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• #### Physics Definition

##### PhysicsIntroduction to Physics

Understanding the science of physics.

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• #### Definition of Inverse

##### Algebra 2Inverse, Exponential and Logarithmic Functions

How to define an inverse.

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• #### Definition of Antiderivatives

##### CalculusAntiderivatives and Differential Equations

How to define an antiderivative.

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• #### The Definition of the Derivative

##### CalculusThe Derivative

How to define the derivative of a function at a point x=a.

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• #### The Distance Formula in Polar Coordinates

##### PrecalculusPolar Coordinates and Complex Numbers

How to derive the distance formula for polar coordinates.

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• #### Civil Liberties 101

##### AP US GovernmentAP US Government Videos

How can we balance individual rights with the public good?

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• #### Proportional Segments Between Parallel Lines

##### GeometrySimilarity

How to prove two triangles are similar using a line parallel to a base.

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