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5. The extent of a two-dimensional surface enclosed within a boundary
7. A triangle with two sides of equal length
9. A triangle with each of its three sides of different lengths
11. A straight line from the center to the circumference of a circle
12. Lines that are side by side and having the same distance continuously between them
14. A triangle with all three sides of equal length
15. A straight line passing from side to side through the center of a body or figure, especially a circle or sphere

1. A plane figure with at least three straight sides and angles
2. A round plane figure whose boundary consists of points equidistant from a fixed point
3. A flat surface that extends infinitely in all directions
4. Lines at an angle of 90 degrees to each other
6. A polygon with three edges and three vertices
8. The continuous line forming the boundary of a closed geometric figure
10. The amount of space that a substance or object occupies
13. A regular quadrilateral with four equal sides and four right angles