Answer:

let the angles be 4x,5x and 9x

4x + 5x + 9x = 180∘

18x = 180∘

⇒x = 10∘

So the angles are,

4×10∘ = 40∘

5×10∘ = 50∘

9×10∘ = 90

One of the angle is 90∘, so the triangle is right angled triangle.

Explanation:

hnn...

actually kuch issue tha isiliye.

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→ an isosceles triangle.