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posted by lindsay on Thursday, May 3, 2012 at 10:27pm.

In the triangle ABC, the sides AB and BC have lengths 7cm and 8cm respectively, and angle B is obtuse. the area of the triangle is 14 root 3 cm^2. Find a.The size of angle B b. The length of AC

formula for area of triangle = (1/2)ab sinØ, where Ø is the contained angle of sides a and b (1/2)(7)(8) sinØ = 14√3 sin Ø = 28√3/56 = √3/2 Ø = 60°

now use the cosine law to find AC

given triangle ABC with

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