Avoiding a Pentagon

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Can you draw points on a piece of paper so that it is not possible to connect them to form a convex pentagon?

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Dividing a Trapezoid

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Divide a given shape into 4 congruent shapes.

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N-Sided Circle?

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Compare the perimeters of polygons to the circumference of the circle.

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Round Robin Tournament

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Use the sides and diagonals in a regular polygon to create a round robin tournament.

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Diagonals in a Polygon

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Consider the number of diagonals in a triangle, quadrilateral, pentagon, hexagon, heptagon, and octagon.

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Symmetry Lines II

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Find polygons that have line symmetry. Many polygons do not have line symmetry.

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Symmetry Lines

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Determine the number of symmetry lines a polygon has.

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Magic Triangle

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Place the digits 1 through 9 in the circles in a very special way.

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Counting Triangles

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Determine the number of triangles in the diagram.

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Non-Overlapping Triangles

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Use three lines to form as many triangles as possible.

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