Angle Sum in Triangles & Quadrilaterals

A triangle is a polygon with three sides and three angles while a quadrilateral is a polygon with four sides and four angles. This allows us to understand the relationships between the sum of the angles... A triangle is a polygon with three sides and three angles while a quadrilateral is a polygon with four sides and four angles. This allows us to understand the relationships between the sum of the angles of a triangle and quadrilateral.
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