3 sides,right angle,acute angles,3 angles,angles,acute angle,different sizes,has one los,have 180 degrees,180,triangles,1 los,symmetrical,acute angles,3 sides,similar length,isosceles triangles,scalene triangles,obtuve qngle,180 degrees,symmetry,equilateral,have 3 angels,right angels,obtuse angle,aceite angles,it has 3 side,scalene,3 right . cute angle,acute angels,isosceles,90,3 angles, 3 sides,,angle,angles acute angle,