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Explore This Topic: Do all quadrilaterals have 360 degrees? Yes. How do the angles inside a quadrilateral add up to 360? If you cut any quadrilateral along one of its diagonals, the figures formed are two triangles. - read more

Why does all quadrilaterals add up to 360 degrees? Proof: Draw any quadrilateral. Draw a line from one corner to the opposite corner. This line is called a diagonal and quadrilaterals have two of them. - read more

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