Solve these clues to fill the grid.
- State of matter with a fixed shape (plural)
- 1 Across
- A solid bounded by a ___ surface and two parallel planes
- 4 Across
- A way of regarding situations or topics etc
- 9 Across
- A polyhedron having a polygonal base and triangular sides with a common vertex
- 10 Across
- The United States federal department charged with conservation and the development of natural
- 13 Across
- Someone who has won first place in a competition (plural)
- 14 Across
- The outermost level of the land or sea
- 1 Down
- The space between two lines or planes that intersect
- 2 Down
- Airtight sealed metal container for food or drink or paint etc
- 3 Down
- A straight line connecting the center of a circle with two points on its perimeter
- 5 Down
- A science dealing with the logic of quantity and shape and arrangement
- 6 Down
- A particular geographical region of indefinite boundary
- 7 Down
- A parallelogram with four right angles
- 8 Down
- The length of a line segment between the center and circumference of a circle or sphere
- 11 Down
- A polyhedron with two congruent and parallel faces and whose lateral faces are parallelograms
- 12 Down
- The base part of a tree that remains standing after the tree has been felled
- 15 Down