Homework Help: geometry

Posted by sally on Sunday, April 11, 2010 at 4:57pm.

A segment that is a units long makes a C-degree angle with a segment that is b
units long. In terms of a, b, and C, find the third side of the triangle defined by this SAS description. You have done numerical versions of this question. Start by finding the length
of the altitude drawn to side b, as well as the length of the perpendicular projection of side
a onto side b. The resulting formula is known as the Law of Cosines.

3. What is the area of the triangle defined by a, b, and C?

geometry - bobpursley, Sunday, April 11, 2010 at 6:21pm
find the third side with the law of cosines.

Then, area= sqrt((s-a)(s-b)(s-c)s)

where s is 1/2 the perimeter. Perimeter then is a+b+thirdside.

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