equilateral triangle has all angles of 60 degrees
isosceles triangle has only two equal angles
scalene triangle have no equal angles
acute triangle has all angles less than 90 degrees
right angle triangle has one angle of 90 degrees
obtuse triangle has one angle greater than 90 degrees
right isosceles triangle has 90, 45, 45 degree angles
assuming two angles are the same:
acute isosceles triangle can range from <90,>45,>45 down to >0,<90,<90
obtuse isosceles triangle can range from >90,<45,<45 up to <180,>0,>0
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