Flipped Math
Reference Triangles
It is all about where the side is located. Pupils use their knowledge of angles in standard position to find reference angles. They use the Pythagorean Theorem to find lengths along a terminal side of an angle to determine the exact...
Brightstorm
Radian Measure of Angles - Concept
An informative lesson begins with a concept video explaining how radians are figured. Then it offers videos of four progressively difficult guided practice problems.
Khan Academy
Khan Academy: Trigonometry: Radians and Degrees
Video defining radians. Examples shown for converting radians to degrees and vice versa. [9:55]
Khan Academy
Khan Academy: Geometry: Inscribed and Central Angles
Proof that the measure of an inscribed angle is half the measure of a central angle when the angles intercept the same arc. [14:16]
Math TV
Math tv.com: Trigonometric Functions: Angles, Degress, and Special Triangles
Students learn about the notation and vocabulary associated with angles and triangles. The learning resource consists of a video tutorial and a worksheet with practice problems. In the left hand menu, click Trigonometry, Trigonometric...
Khan Academy
Khan Academy: Trigonometry: Radians: Example: Radian Measure and Arc Length
This video shows an example that thinks about the relationship between an arc length and the angle that is subtended by the arc. [3:29]
Khan Academy
Khan Academy: Basic Trigonometric Ratios: Using Trig Functions
Video using the basic trigonometric functions to find the length of a side in a right triangle. Examples are given with angle measures in radians.
Virtual Nerd
Virtual Nerd: How Do You Find the Tangent of an Angle in a Right Triangle?
In this tutorial, find out how to find the tangent of a particular angle in a right triangle. [3:13]
Khan Academy
Khan Academy: Algebra Ii: Radians: Introduction to Radians
Understanding the definition and motivation for radians and the relationship between radians and degrees. [10:51]
Khan Academy
Khan Academy: Trig to Solve the Sides and Angles of a Right Triangle
Worked example using trigonometry to solve for the lengths of the sides of a right triangle given one of the non-right angles.
Khan Academy
Khan Academy: Unit Circle: Example: The Signs of Sine and Cosecant
Using the unit circle definition to think about the signs of the sine and the cosecant of a negative angle. [3:19]
Khan Academy
Khan Academy: Basic Trigonometric Ratios: Basic Trigonometry Ii
A few more examples using SOH CAH TOA. Examples of finding sine, cosine and tangent for two different right triangles, including finding side lengths by the Pythagorean Theorem and rationalizing the denominator.
Khan Academy
Khan Academy: Geometry: Basic Trigonometry
Problems address the equation of a circle, basic trignometry.
Khan Academy
Khan Academy: Radians: Converting Degrees to Radians
Worked example to help understand how we covert degrees to radians.
Khan Academy
Khan Academy: Trigonometry: Tangent Identities: Periodicity
Sal solves a problem by considering the periodicity of the tangent function. [4:01]
Khan Academy
Khan Academy: Algebra Ii: Trig Values of Special Angles: Triangle in Unit Circle
Sal finds the trigonometric values of pi/4 using the unit-circle definition. [7:53]
Study Pug
Study Pug: Coterminal Angles
This video discusses coterminal angles which are angles that share the same terminal arms. [17:06]
Sophia Learning
Sophia: Cotangent: Lesson 4
This lesson introduces the concept of the cotangent of an angle. It is 4 of 5 in the series titled "Cotangent." [2:21]
Sophia Learning
Sophia: Drawing an Angle on the Unit Circle: Lesson 2
Given a particular angle, this lesson demonstrates how it can be drawn on a unit circle. It is 2 of 7 in the series titled "Drawing an Angle on the Unit Circle."
Sophia Learning
Sophia: Drawing an Angle on the Unit Circle: Lesson 4
Given a particular angle, this lesson demonstrates how it can be drawn on a unit circle. It is 4 of 7 in the series titled "Drawing an Angle on the Unit Circle."
Sophia Learning
Sophia: Drawing an Angle on the Unit Circle: Lesson 7
Given a particular angle, this lesson demonstrates how it can be drawn on a unit circle. It is 7 of 7 in the series titled "Drawing an Angle on the Unit Circle."
Sophia Learning
Sophia: Drawing an Angle Over 360 Degrees: Lesson 3
This lesson show how an angle of over 360 degrees can be depicted on a unit circle. It is 3 of 8 in the series titled "Drawing an Angle Over 360 Degrees."
Sophia Learning
Sophia: Drawing an Angle Over 360 Degrees: Lesson 4
This lesson show how an angle of over 360 degrees can be depicted on a unit circle. It is 4 of 8 in the series titled "Drawing an Angle Over 360 Degrees."
Sophia Learning
Sophia: Drawing an Angle Over 360 Degrees: Lesson 6
This lesson show how an angle of over 360 degrees can be depicted on a unit circle. It is 6 of 8 in the series titled "Drawing an Angle Over 360 Degrees."