Pentagram Triangles

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How many triangles are formed?

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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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Lining Up to Find Triangles

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Draw lines to find the largest amount of triangles.

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Toothpick Transfer

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Readjust a diagram to form a number of triangles.

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Hidden Triangles

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Count the number of triangles in a picture.

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SAM

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Explore Symmetry with Altitudes and Medians.

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Triangular Numbers

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Explore the sequence of triangular numbers.

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Triangles Inscribed Inside Triangles

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Explore properties of triangles constructed using the midpoint of given triangles.

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