Geometry

3. A part of a circle.
5. A line that intersects a circle at exactly one point.
6. A three-dimensional object with two parallel congruent bases and rectangular or parallelogram-shaped sides.
9. A three-dimensional object with two circular bases that are congruent and parallel.
10. lines: Two lines that intersect at a right angle.
11. A three-dimensional object whose surface consists of all points that are equidistant from a given point called the center.
14. angle: An angle that measures exactly 180 degrees.
15. A line segment that connects two points on a circle.
16. Two shapes that have the same size and shape.
17. The amount of space occupied by a three-dimensional object.
18. Two shapes that have the same shape but different sizes.

1. A three-dimensional object with a polygon base and triangular faces that meet at a common vertex.
2. A line segment that connects two points on a circle and passes through the center of the circle.
4. A line segment that connects the center of a circle to any point on the circle.
6. lines: Two lines in a plane that do not intersect and are always the same distance apart.
7. lines: Two lines that cross each other at a point.
8. (π): The ratio of the circumference of a circle to its diameter, approximately 3.14.
12. area: The total area of the faces or surfaces of a three-dimensional object.
13. A three-dimensional object with a circular base and a curved surface that meets at a common vertex.
14. The region bounded by two radii of a circle and the arc they intercept.
15. A set of points in a plane that are equidistant from a given point called the center.