Regular Heptagon (7 sides) — free printable diagram

How many sides does a heptagon have?

A heptagon is a seven-sided shape — a polygon with 7 sides and 7 corners. A regular heptagon has 7 equal sides and 7 equal angles of ≈128.6°.

Sides

7

Vertices (corners)

7

Interior angles add up to

900°

Each interior angle (regular)

≈128.6°

Each exterior angle (regular)

≈51.4°

Diagonals

14

Lines of symmetry (regular)

7

Also called

seven-sided figure, seven-sided polygon

• The interior angles of any heptagon add up to (7 − 2) × 180° = 900°.
• A regular heptagon has every angle the same, so each one measures 900° ÷ 7 = about 128.6°.
• A heptagon has 14 diagonals — 7 × (7 − 3) ÷ 2.