Khan Academy
Khan Academy: Trigonometry: Basic Trigonometry Ii
Continuation of video lesson introducing the basic trigonometric ratios. Examples of finding sine, cosine and tangent for two different right triangles, including finding side lengths by the Pythagorean Theorem and rationalizing the...
Khan Academy
Khan Academy: Trigonometry: Basic Trigonometry
Video introducing the basic trigonometry ratios sine, cosine, and tangent. Examples are shown for the two acute angles of a right triangle. Includes link to additional practice problems. [9:17]
Sophia Learning
Sophia: Secant: Lesson 1
This lesson introduces the concept of the secant of an angle. It is 1 of 5 in the series titled "Secant."
Sophia Learning
Sophia: Secant: Lesson 4
This lesson introduces the concept of the secant of an angle. It is 4 of 5 in the series titled "Secant."