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28 July, 16:48

Find angle A if measurement of arc mDE is equal to 70° and measurement of arc mBC is equal to 12°.

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  1. 28 July, 20:12
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    Angle A = 29°

    Step-by-step explanation:

    Remember one thing that when two secants intersect in the exterior of a circle then A=1/2 (mDE-mBC) it means that the measure of the angle formed is one half the difference of the measures of the intercepted arcs

    Now put the values in the equation.

    A=1/2 (mDE-mBC)

    A=1/2 (70-12)

    A=1/2 (58)

    A = 29°

    Thus angle A = 29° ...
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