Octagon shape

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a red stop sign is shown in the middle of a white background with black border

When you are planning a unit about preschool shapes, octagon should be part of your plan. Students will delight in learning this big word and they will search their surroundings to find more octagons. Here you will find books, activities and games to complete the unit.

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an octagon is shown in the shape of a pentagon, with no sides

In geometry, a hendecagon (also undecagon) is an 11-sided polygon. The name "undecagon" is often seen as incorrect, but the matter is up for debate. The Greek prefix 'hen', is preferable to the Latin 'uni' or 'un'. A regular hendecagon has internal angles of 147.27 degrees. The area of a regular hendecagon with side length is given by A regular hendecagon is not constructible with compass and straightedge. The Canadian dollar coin, the loonie, is patterned on a regular hendecagonal prism, as…

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