Law of Sines & Cosines Worksheets

Trigonometry Worksheets

There are six sets of Trigonometry worksheets:

• Sin, Cos, Tan
  
• Sin & Cos of Complementary Angles
  
• Find Missing Sides
  
• Find Missing Angles
  
• Area of Triangle using Sine
  
• Law of Sines and Cosines
  

Law of Sines and Cosines Worksheets

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:

c² = a² + b² - 2ab cos(C)

Have a look at this video if you need to review how to use the Law of Sines and Cosines.

• Law of Sines

• Law of Cosines

Click on the following worksheet to get a printable pdf document.
Scroll down the page for more Law of Sines and Cosines Worksheets.

 

More Law of Sines and Cosines Worksheets

Printable
(Answers on the second page.)
Law of Sines & Cosines Worksheet #1
Law of Sines & Cosines Worksheet #2

Online
Trigonometry (sine, cosine, tangent)
Trigonometry (sine, cosine, tangent)
Trigonometry (using a calculator)
Inverse Trigonometry (using a calculator)
Trigonometry (find an unknown side)
Trigonometry (find an unknown angle)

Using Sine
Using Cosine
Using Tangent
Using Sine, Cosine or Tangent

Trigonometry Applications Problems

Law of Sines or Sine Rule
Law of Sines

Law of Cosines or Cosine Rule
Law of Cosines

Related Lessons & Worksheets

Trigonometry Lessons

More Printable Worksheets

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