40° + 25° + 115° = 180°, which is the correct total for the angles (in degrees) of a triangle. There are infinitely many triangles with those angles.
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As many as you like but they will all be scalene triangles
There is 180 degrees in all triangles
It is an isosceles triangle with 2 equal sides.
More than one unique triangle exist
You see how many triangles fit into the shape and multiply by 180 degrees