In the diagram, M is the midpoint of  and ∠XYZ = 16°. The measure of ∠XZY is:

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RRC Group D Previous Paper 9 (Held On: 27 Sep 2018 Shift 1)
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  1. 68°
  2. 84°
  3. 81°
  4. 74°

Answer (Detailed Solution Below)

Option 4 : 74°
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RRB Group D Full Test 1
100 Qs. 100 Marks 90 Mins

Detailed Solution

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In ΔXYM,

∠XYM + ∠XMY + ∠YXM = 180°

⇒ 16° + (180° – ∠XMZ) + ∠YXM = 180°      (∵ ∠XMY + ∠XMZ = 180°)

⇒ 16° + 180° – 32° + ∠YXM = 180°

⇒ ∠YXM = 16° = ∠XYM

∴ YM = XM = MZ      (∵ M is the midpoint of YZ)

∴ ∠MXZ = ∠MZX = ∠XZY

In ΔXMZ

∠XMZ + ∠MXZ + ∠MZX = 180°

⇒ 32° + ∠MXZ + ∠MXZ = 180°

⇒ 2 × ∠MXZ = 180° – 32°

⇒ ∠MXZ = 74° 

⇒ ∠XZY = ∠MXZ = 74°

∴ The value of ∠XZY is 74°

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