1. The shape of the playground was a perfect decagon, with ten equal sides.
2. The ancient Greek temple had a decagon shape, symbolizing the ten virtues of their religion.
3. The flag of Japan features a red circle in the center, which is inscribed in a white decagon.
4. The newly built gazebo in the park had a decagon roof, giving it a unique look.
5. The math teacher challenged her students to calculate the area of a regular decagon.
6. The clock tower in the town square had a decagon base, making it stand out among the other buildings.
7. The stained glass windows in the cathedral were arranged in a beautiful decagon pattern.
8. The company logo was designed with a decagon shape to symbolize stability and strength.
9. The crop circle discovered in the field was a perfect decagon, sparking rumors of extraterrestrial involvement.
10. The art project required the students to create a decagon using various materials like wood, paper, and fabric.