Learn about the Law of sines and how to use it in order to find missing side lengths and angles in general triangles.
Sine_and_cosine_of_complementary_angles
Learn about the relationship between the sine of an angle and the cosine of its complementary angle, which is the angle that completes to 90°.
Introduction_to_the_trigonometric_ratios
Learn what sine, cosine, and tangent are.
Solving_for_an_angle_in_a_right_triangle_using_the_trigonometric_ratios
Learn how to find an acute angle in a right triangle when given two side lengths.
Use the power of trigonometry in order to solve various problems that involve triangles.
Solve real-world problems that can be modeled by right triangles, using trigonometry.
Trigonometric_ratios_and_similarity
Learn how the trigonometric ratios are derived from triangle similarity considerations.
Learn about the Law of cosines and how to use it in order to find missing side lengths and angles in general triangles.
Solving_for_a_side_in_a_right_triangle_using_the_trigonometric_ratios
Learn how to find a side length in a right triangle when given one side length and one acute angle.
The_reciprocal_trigonometric_ratios
Learn about the remaining three side ratios in a right triangle: the secant, the cosecant, and the cotangent.
We hate to pick favorites, but there really are certain right triangles that are more special than others. In this tutorial, we pick them out, show why they're special, and prove it! These include 30-60-90 and 45-45-90 triangles (the numbers refer to the measure of the angles in the triangle).
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