Law of Cosines Worksheets and Printables

by Deb Russell
Deb Russell is a school principal who has taught mathematics at all levels. She is also a freelance writer with more than 14 years of experience.
Updated April 30, 2017
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Law of Cosine Worksheet # 1

Law of Cosines Worksheets
Law of Cosines Worksheet # 1. D. Russell

Print the Cosine Worksheet/Printable in PDF Determine which law of cosine to use and answer the worksheet questions.

Print PDF worksheet above, the answers are on the 2nd page of the PDF. Determine the area of the triangle to the nearest tenth. Use the appropriate Cosine formula (law of cosine) to calculate the area of the triangle. The answers are on the 2nd page of the PDF.

Prior to working with the trigonometry formulas/laws of cosines, learners should understand Pythagorean's Theorem, area and perimeters of triangles as well as having a strong understanding of angles. Typically, sin and cosine are addressed in the ninth or tenth grades in most jurisdictions.

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Law of Cosine Worksheet # 2

Cosine Worksheet
Cosine Worksheet. D. Russell

Print the Cosine Worksheet/Printable in PDF Determine which law of cosine to use to solve the area of the triangle. The answers are on the 2nd page of the PDF worksheet.

Print PDF worksheet below, then find the area of the triangle and answer to the nearest tenth. Use the Cosine formula (law of cosine) to calculate.

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Law of Cosine Worksheet # 3

Triangle Worksheets
Triangle Worksheet. D. Russell

Print the Cosine Worksheet in PDF. Determine which law of cosine to use to solve the following, then answer the questions on the PDF.

Print PDF worksheet above, answers are on the 2nd page of the PDF. Use the Cosine formula (law of cosine) to calculate the area of the triangle to the nearest tenth.

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Law of Cosine Worksheet # 4

Cosine Worksheet
Cosine Worksheet. D. Russell

Print PDF worksheet below, answers are on the 2nd page of the PDF. Determine the missing unit to find the area of the triangle and answer to the nearest tenth. Use the Cosine formula (law of cosine) to calculate.

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Law of Cosine Worksheet # 5

Triangle Area worksheet
Find the Area of the Triangle.

Print the PDF worksheets with the answers on the 2nd page of the PDF. Find the area of the triangle and answer to the nearest tenth. Use the Cosine formula (law of cosine) to calculate.