Math

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Across
  1. 4. a four-sided plane rectilinear figure with opposite sides parallel
  2. 6. a plane figure with three straight sides and three angles.
  3. 8. a two-dimensional figure formed by combining two or more basic two-dimensional shapes
  4. 9. the ratio of a circle's circumference to its diameter.
  5. 10. a round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center).
Down
  1. 1. the distance around the circle, also known as the perimeter of the circle
  2. 2. the amount of space enclosed within a two-dimensional shape or surface
  3. 3. a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.
  4. 5. the continuous line forming the boundary of a closed geometric figure
  5. 7. a straight line from the center to the circumference of a circle or sphere.