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  • Laws of sines and cosines review (article) | Khan Academy
    Review the law of sines and the law of cosines, and use them to solve problems with any triangle
  • Solving for a side with the law of cosines
    Learn how to use the law of cosines to find the missing side length of a triangle when given two side lengths and the contained angle measure
  • Law of sines: solving for a side - Khan Academy
    The Law of Sines just tells us that the ratio between the sine of an angle, and the side opposite to it, is going to be constant for any of the angles in a triangle
  • Proof of the law of cosines - Khan Academy
    With that said, this is the law of cosines, and if you use the law of cosines, you could have done that problem we just did a lot faster because we just-- you know, you just have to set up the triangle and then just substitute into this, and you could have solved for a in that ship off-course problem
  • Trigonometric ratios in right triangles (article) | Khan Academy
    Learn how to find the sine, cosine, and tangent of angles in right triangles
  • Intro to the trigonometric ratios (video) | Khan Academy
    Sin, cos, and tan are trigonometric ratios that relate the angles and sides of right triangles Sin is the ratio of the opposite side to the hypotenuse, cos is the ratio of the adjacent side to the hypotenuse, and tan is the ratio of the opposite side to the adjacent side They are often written as sin(x), cos(x), and tan(x), where x is an angle in radians or degrees
  • Non-right triangles trigonometry | Math | Khan Academy
    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 and cosines, to find all of the side lengths and all of the angle measures in any triangle with confidence





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