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

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)

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

Click on the following worksheet to get a printable pdf document.

Scroll down the page for 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

Try the free Mathway calculator and
problem solver below to practice various math topics. Try the given examples, or type in your own
problem and check your answer with the step-by-step explanations.

We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.