A regular polygon has sides that are equal in length and equal angles. These shapes are all regular polygons. A regular triangle is called an equilateral triangle. A regular quadrilateral is ...

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This tool allows you to learn about various geometric solids and their properties. You can manipulate and color each shape to explore the number of faces, edges, and vertices, and you can also use ...

Angles in triangles Learn how to calculate angles in triangles. Calculating angles around a point Learn how to identify and measure angles.