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Triangles 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).