Posted by **Anonymous** on Friday, December 2, 2011 at 5:21pm.

Triangle XYZ has angles measurements are in the ratio 1:3:5. What is the measurement of the largest angle?

- Agrebrla -
**Damon**, Friday, December 2, 2011 at 5:40pm
the angle opposite the biggest side is biggest.

law of cosines

5^2 = 1^2+3^2 - 2 *1*3 cos A

- Algebra - update -
**Steve**, Friday, December 2, 2011 at 5:51pm
However, since we don't know the sides, the law of cosines doesn't help us much.

1+3+5 = 9

180/9 = 20

so the angles are 20:60:100

The largest angle is 100°

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