Right Angle Triangle
A triangle is a regular polygon, with three sides and the sum of any two sides is always greater than the third side. This is a unique property of a triangle. In other words, it can be said that any closed figure with three sides and the sum of all the three internal angles is equal to 180°.
Being a closed figure, a triangle can have different types and each shape is described by the angle made by any two adjacent sides.
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