Solve these clues to fill the grid.
- Ellipse in which the two axes are of equal length
- 1 Across
- A particular environment or walk of life
- 3 Across
- Greek philosopher and mathematician who proved the ___ theorem
- 8 Across
- The boundary line encompassing an area or object
- 11 Across
- A straight line connecting any two vertices of a polygon that are not adjacent
- 12 Across
- A plane figure bounded by two radii and the included arc of a circle
- 13 Across
- A government building with five sides that serves as the headquarters of the United States
- 14 Across
- Plaything consisting of a light frame covered with tissue paper
- 15 Across
- A parallelogram with four equal sides
- 2 Down
- The 90 degree ___ between two perpendicular lines
- 4 Down
- A word that expresses a meaning ___ to the meaning of another word
- 5 Down
- A straight line connecting the center of a circle with two points on its perimeter
- 6 Down
- A parallelogram with four right angles
- 7 Down
- Something having the property of being analogous to something else
- 8 Down
- Nearest in space or position
- 9 Down
- A plane rectangle with four equal sides and four right angles
- 10 Down