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Question

If the sides of a triangle are in the ratio 1:2:1 then the triangle is a


  1. acute-angled triangle

  2. right-angled triangle

  3. obtuse-angled triangle

  4. None


Solution

The correct option is B

right-angled triangle


Given, sides of a triangle are in the ratio 1:2:1,

Let the sides be 1x,2x,1x,

Now, 1x2+1x2=2x2

Sum of the squares of two sides is equal to the square of the third side.

The triangle is a right - angled triangle.

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