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Classify triangles By angles Acute triangle has three acute angles Right triangle has one right angle two acute angles Obtuse triangle has one obtuse angle two acute angles Equiangular triangle Has all 3 angles congruent By sides Scalene triangle has no sides congruent Isosceles triangle has 2 sides congruent Equilateral triangle has all 3 sides congruent Draw acute scalene triangle Draw acute isosceles triangle Draw an acute equilateral triangle Draw a right isosceles triangle Draw a right equilateral triangle • Not possible Draw an obtuse scalene triangle Draw an obtuse isosceles triangle Draw an obtuse equilateral triangle • Not possible Draw an equiangular equilateral triangle Draw an equiangular scalene triangle • Not possible Draw an equiangular isosceles triangle • Not possible Scalene Isosceles equilateral Acute Right NP Obtuse NP