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8 March, 01:36

In the diagram, line a is the perpendicular bisector of KM. What is the length of KM? 22 units 40 units 44 units 80 unit

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  1. 8 March, 02:28
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    We know that:

    9 x - 5 = 7 x + 7 (because line a is tre perpendicular bisector of KM)

    9 x - 7 x = 7 + 5

    2 x = 12

    x = 12 : 2

    x = 6

    Also: KM = 2 * (6 x + 4) = 2 * (6 * 6 + 4) =

    = 2 * (36 + 4) = 2 * 40 = 80

    Answer:

    D) 80 units.
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