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Yesterday, 19:46

Find the value of x when angle a is 90°, angle b is 40°, and angle c is x+57.

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  1. Yesterday, 20:09
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    The sum of the all angles are 180.

    Then, a + b + c = 180.

    Given, a = 90, b = 40 and c = x + 57.

    90 + 40 + c = 180.

    130 + c = 180

    c = 180 - 130

    c = 50

    Now plug in the value for c and then solve for x.

    c = x + 57

    50 = x + 57

    50 - 57=x

    -7 = x

    x = - 7
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