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# Sine and Cosine Worksheets

## Finding Sine, Finding Cosine

Right triangles have three sides which means only three pairs of sides can be compared. The Trigonometric Functions (also called ratios) are ratios that compare the lengths of two sides of the right triangle. If you are given side lengths in right triangles, you will be able to find sine, cosine and tangents. Using the trig formulas will help you get the worksheets below. You can also use a calculator/spreadsheet or a table if you are given the measure of the acute angle in degrees. You can often find the table listing in textbooks or online stating the angle, sine, cosine and tangent. For instant, for an angle of 50°, the sine is .7660, the cosine is .6428 and the tangent is 1.1918.

The sine is the first of three major trigonometric functions. Trigonometry gives us a way to find a side or angle in right triangle with a minimum amount of knowledge about the triangle.p The cosine is the second of the three major trigonometric functions. Like the sine, the cosine also represents a ratio between two sides of a right angled triangle.

Deb Russell
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