Basic Geometry

2. A flat surface with no thickness.
4. A 3-dimensional object shaped like a ball.
6. a three dimensional (3D) object.
7. A view into the inside of something made by cutting through it.
9. a solid object with:two identical flat ends that are circular or elliptical and one curved side.
11. A point where two or more line segments meet. A corner.
12. no internal angle is greater than 180°
13. A triangle with all sides of different lengths.
15. where the interior angle is greater than 180°
19. A polyhedron (a flat-sided solid object) with 4 faces.
20. An angle less than 90°
21. The total area of the surface of a three-dimensional object.

1. A triangle with all three sides of equal length.
3. An obtuse angle is more than 90° but less than 180°
5. A solid with flat faces. Each flat face is a polygon.
6. The outside layer of an object.
8. A triangle with two equal sides.
10. any of the individual flat surfaces of a solid object
14. A line segment on the boundary joining one vertex (corner point) to another.
16. Lines that are at right angles (90°) to each other
17. on a plane that never meet. They are always the same distance apart.
18. An angle that is more than 180° but less than 360°