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susanwiederspan
Yup. The angles of a triangle must add up to 180°—no more, no less.

These angles do: [tex]70+90+20=160+20=180[/tex]

As for which kind, we can classify it based on the 90°-angle. Since that's a right angle, we have a right triangle. Additionally, it is scalene.
Firephenoix
The angle sum property is that all the angles of a triangle is 180. 

 therefore, three angles given are: angle 70, angle 90 and angle 20

              70+90+20= 180
  
        there its makes a triangle.


   There is a angle 90, so it will make a right angled triangle...

 Hope this answer helped!! :) :)

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