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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