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TrianglesTriangles types and definitions 

Acute triangle A triangle where all three internal angles are acute (less than 90 degrees). 
Isosceles triangle An isosceles triangle has two angles of the same measure and two two sides of the equal length 
Obtuse triangle A triangle that has one angle that measures more than 90กใ 
Scalene triangle In a scalene triangle, all sides and angles are different from one another 
Right triangle In right triangle, one interior angles measures 90กใ (a right angle). 
