Geometry crossword

3. the amount of space covering the outside of a three-dimensional shape.
4. side of a polygon or a face of a polyhedron, particularly one oriented perpendicular to the direction in which height is measured, or on what is considered to be the "bottom" of the figure
7. a second base which is a translated copy of the first, and n other faces, necessarily all parallelograms, joining corresponding sides of the two bases. All cross-sections parallel to the bases are translations of the bases
8. Gets smaller as it gets higher
10. Half of diameter
15. the amount of space covering the outside of a three-dimensional shape but the bases don't count
17. A=πr2
18. all sides summed up
20. two straight lines or rays meet at a common endpoint

1. Not a 2d shape
2. flat surface on a solid, and edges are the lines at which faces meet
5. the same shape, congruent corresponding angles (meaning the angles in the same places of each shape are the same) and equal scale factors
6. C=🥧D
9. the name of this unit
11. Radius x 2
12. no angles, 1 side
13. a quadrilateral with only one pair of parallel sides.
14. A shape with 4 sides
16. A=width X base
19. 3 angles, 3 sides