noun
- a polygon with ten sides and ten angles
Usage: geometry
Examples
- The students were asked to draw a decagon on their worksheets.
- A regular decagon has all sides and angles equal.
- The architect incorporated a decagonal window into the building design.
- Each interior angle of a regular decagon measures 144 degrees.
- The stop sign is an octagon, but a decagon has two more sides.
- She calculated the area of the decagon using the given formula.