Agrebrla

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

• Agrebrla -

the angle opposite the biggest side is biggest.
law of cosines
5^2 = 1^2+3^2 - 2 *1*3 cos A

• Algebra - update -

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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