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    • Question

      In triangle XYZ, a point M lies on YZ such that ∠XMY =

      ∠XMZ. Given XY = 54 cm, XZ = 36 cm, and YZ = 30 cm, find the length of YM.
      A 20 cm Correct Answer Incorrect Answer
      B 60 cm Correct Answer Incorrect Answer
      C 46 cm Correct Answer Incorrect Answer
      D 18 cm Correct Answer Incorrect Answer

      Solution

      ATQ,

      Since ∠XMY = ∠XMZ, XM is the angle bisector of ∠X.

      By Angle Bisector Theorem:

      XY / XZ = YM / MZ

      Let YM = x cm

      Then MZ = 30 - x cm

      54 / 36 = x / (30 - x)

      ⇒ 3 / 2 = x / (30 - x)

      Cross-multiplying:

      3(30 - x) = 2x

      90 - 3x = 2x

      90 = 5x

      x = 18

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