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Trigonometric ratios are not only useful for right triangles, but also for any other kind of triangle. In this unit, you will discover how to apply the sine, cosine, and tangent ratios, along with the laws of sines …

Practice set 1: Solving for a side Trigonometry can be used to find a missing side length in a right triangle. Let's find, for example, the measure of A C in this triangle: We are given the measure of …

Using what we know about 30-60-90 triangles to solve what at first seems to be a challenging problem. Created by Sal Khan.

It depends on the context of the problem, but it normally doesn't matter what side you put first. However, you have to stick with one ratio throughout the whole problem. Consistency is important in …

In case you may not know how to figure out what the Sin (30) is, I recommend drawing a right triangle and labeling the 30, 60, 90 angles to get a full understanding.

OC is perpendicular to AC (line tangent to a circle is perpendicular to the radius drawn to the point of tangency), making OAC a right triangle. OA is the hypotenuse, OC and AC are the legs.

Given one side length and an acute angle in a right triangle, find another side using trigonometry.

Discover how to measure angles, distances, and heights using trigonometric ratios and the unit circle. Learn how to use sine, cosine, and tangent to solve real-world problems involving triangles and …

Learn how to use trig functions to find an unknown side length in a right triangle.