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Let∠A=x. ∠B=2x and ∠C=3x.
∠A+∠B+∠C=180° (Angle sum property of triangle)
The triangle is right angled triangle because one angle measures 90°.
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let x=∠1

2x=∠2 and


∵we know that sum of all the angles of a triangle =180°






∴x=30° , 2x=60° and 3x = 90°.

∵it has 90° angle it is a right angle triangle.

  I hope that this will help u..........................:))

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