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we can write them as 7x 8x and 10x. The sum of the interior angles of a polygon is 180. So:

Divide both sides by 25
x=7 1/5 or simply 7.5 degrees or 7 degrees 30 minutes.

Now substitute the values:
52 degrees 30 minutes
60 degrees
75 degrees.

So the kind of triangle is a scalene triangle, there are no sides equal and we can say that it is an acute triangle xD