Interior Angles

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Explore the sum of interior angles of a quadrilateral.

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Integral Sides

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Explore area and perimeter of quadrilaterals whose sides have integral length.

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Overlapping Squares

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Make more squares from less.

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Perplexing Pentominoes

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Explore with pentominoes.

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Leaving Squares

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Remove toothpicks from the figure to leave five squares.

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Shaded Squares

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Determine the number of “outside” squares in a given figure.

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Relationships

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Explore various relationships in a given construction involving a parallelogram.

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Quadrilaterals Inscribed Inside Polygons

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How many quadrilaterals can be constructed using the vertices of polygons?

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Constructing Quadrilaterals 3

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Given certain quadrilaterals, construct other quadrilaterals with similar properties.

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Quadrilateral Conjectures

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Make conjectures about properties of quadrilaterals and provide examples or counterexamples.

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