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Use the Law of Cosines to solve the triangle. Round your answer to two decimal places.

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Use the Law of Cosines to solve the triangle. Round your answer to two decimal places.

a = 11, b = 15, c = 21

law-of-cosines
solve-triangle

asked Jan 23, 2015 in TRIGONOMETRY by anonymous

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1 Answer

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Step 1:

The sides of triangle are .

Find the angle by using Law of Cosines,

Step 2:

Find the angle by using Law of Cosines,

Step 3:

Sum of the angles of a traingle is 180 degrees.

Solution:

, and .

answered Jan 23, 2015 by david Expert

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