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March 28, 2017

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In a triangle ABC, angle B is 4 times angle A and angle C is 16 degrees less than 5 times angle A.

What is the size of angle A _____
B _____ and C _____

I would like to learn this so please be so kind to walk me through the steps. I appreciate you very much!!!

  • mat116 - ,

    make a diagram, it does not have to be to scale.

    let angle A = x
    (I picked A since both conditions stated used it as a reference)
    "angle B is 4 times angle A" ---> angle B = 4x
    "angle C is 16 degrees less than 5 times angle A" -->angle C = 5x - 16

    Now, what do you know about the 3 angles of a triangle?
    Don't they add up to 180° ?

    so x + 4x + 5x-16 = 180
    10x = 196
    x = 19.6°

    So by the definitions above
    A = 19.6
    B = 78.4
    C = 82

    (check for their sum)

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