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A triangle has three straight sides and three corners.

A triangle has three straight sides and three corners.

Look for triangles in slices of pizza and party hats. Three is the magic number for a triangle.

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A circle is a perfectly round shape with no corners. A circle is a perfectly round shape with no corners. A square has four sides that are all the same length. A square has four sides that are all the same length. A star shape has pointy tips sticking out all around. A star shape has pointy tips sticking out all around. A heart shape stands for love and looks like two bumps and a point. A heart shape stands for love and looks like two bumps and a point. The strongest shape for building is the triangle. The strongest shape for building is the triangle.