In these free math worksheets, students learn to how to find missing sides and angles using law of sines and cosines.
There are two sets of Law of Sines and Cosines worksheets.
How to use the Law of Sines and Cosines?
Law of Sines
The Law of Sines is a trigonometric law that relates the lengths of the sides of any triangle to the sines of its angles. For any triangle with sides of length a, b, and c, and opposite angles A, B, and C, the Law of Sines is expressed as follows:
a/sin(A) = b/sin(B) = c/sin(C)
Note that the Law of Sines is applicable to all types of triangles, not just right triangles.
Law of Cosines
The Law of Cosines is another trigonometric law that relates the lengths of the sides of a triangle to the cosine of one of its angles. For any triangle with sides of length a, b, and c, and opposite angles A, B, and C, the Law of Cosines is expressed as follows:
c 2 = a 2 + b 2 - 2ab cos(C)
Click on the following worksheet to get a printable pdf document.
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