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Circles in Quadrilaterals printable sheet
You may have come across the idea of a cyclic quadrilateral, where it is possible to draw a circle around the quadrilateral so that the circumference passes through all four vertices of the shape.
A tangential quadrilateral is one where it is possible to draw a circle inside it so that the circumference just touches all four sides of the shape.
Here are some examples of tangential quadrilaterals: