geometry

4. A four-sided polygon.
8. Lines that cross at exactly one point
10. The distance around a figure.
11. Triangle A triangle that has one obtuse angle
12. A segment that connects two nonadjacent vertices of a polygon.
14. Two lines that intersect to form four right angles
17. a triangle with all sides equal and all angles equal
19. An eight-sided polygon.
20. A rectangle with 4 equal sides
21. A series of connected line segments that starts and ends at the same place and does not intersect itself anywhere in between.
22. A six-sided polygon.

1. A line segment with one endpoint at the center of a circle and the other endpoint on the circle
2. Distance around a circle (the perimeter)
3. Two geometric objects having the same measure.
5. An angle that measures less than 90°
6. A straight one-dimensional figure having no thickness and extending infinitely in both directions.
7. the intersection point of two sides of a plane figure
9. All its angles=180
13. A location in space – a dot on a piece of paper
15. An angle that measures 90°
16. Lines in a plane that never intersect
18. A figure formed by two line segments or rays with a common endpoint.