Seven sided figure name

A polygon with seven sides is a heptagon. It has seven vertices. A regular heptagon has equal side lengths and equal interior angles, while an irregular heptagon can have unequal sides and angles.

Meaning and context

The sum of its interior angles is (7 − 2) × 180° = 900°. In a regular heptagon, each interior angle is 900°/7, approximately 128.57°. The approximate value does not replace the exact fraction when an exact answer is required.

Examples and usage

Count the straight boundary segments to identify the polygon. A distorted seven-sided outline can still be a heptagon. Equal side lengths are an additional condition, not part of the basic definition of every heptagon.

What to check

Do not confuse a flat polygon with a solid that has seven faces. Faces, edges, and vertices are different features in three-dimensional geometry. Identify the type of object before applying a name based only on one count.

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