Save guides, add subjects and pick up where you left off with your BBC account. Polygons can be regular or irregular in shape. A polygon is a closed 2D shape with at least three sides. A regular ...

A polygon is regular if it is uniform and its faces are all ... sides that are equilateral triangles), the regular dodecahedron (twelve sides that are regular pentagons), and the regular icosahedron ...

Polygons can be regular or irregular. If the angles are all equal, and all the sides are equal in length, it is a regular polygon. To find the sum of interior angles in a polygon, divide the ...