Posted by **hodna** on Monday, April 12, 2010 at 12:12am.

If a triangle has sides of lengths a and b, which make a C-degree angle, then the length

of the side opposite C is c, where c2 = a2 + b2 − 2ab cosC. This is the SAS version of the Law of Cosines. Explain the terminology. Derive an equivalent SSS version of the Law of Cosines, which gives the cosine of the angle in terms of the lengths of the three sides. Now use it to find the angles of the triangle whose sides have lengths 4 cm, 5 cm, and 6 cm.

## Answer this Question

## Related Questions

- geometry - Triangle PEA has a 20-degree angle at P and a 120-degree angle at E, ...
- geometry/math pls help - The lengths of segments PQ and PR are 8 inches and 5 ...
- Geometry - x ________________<20* |<90* y | |<70* (hypotenuse length ...
- Geometry - One side of a triangle is x inches longer than another side. The ray...
- Math (Trig) - A triangle ABC has a trisected angle A. The angle trisectors ...
- math pls - The lengths of segments PQ and PR are 8 inches and 5 inches, ...
- geometry - What is the length of the side opposite to a 30 degree angle if it is...
- geometry - An angle bisector of a triangle divides the opposite side of the ...
- Trig - The lengths of segments PQ and PR are 8 inches and 5 inches, respectively...
- geometry - the sides of a triangle have lengths 4x+1, 2x+1 and 6x-1. if the ...

More Related Questions