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19 February, 06:48

In ∆ABC, ∠A is a right angle and m∠B = 45°. Find BC.

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Answers (1)
  1. 19 February, 10:15
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    Step-by-step explanation:

    In ∆ABC, if
    Now,

    Cos B = base/height

    Cos B = AB / BC

    BC = AB/cos 45°.
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