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Across 2. A plane surface of a geometric solid 5. An instrument for drawing or describing circles 9. A surface or solid bounded by two parallel planes 10. An equilateral parallelogram, including the square as a special case 12. A quadrilateral plane figure having two parallel and two nonparallel sides 14. The branch of mathematics that deals with the deduction of the properties, measurement, and relationships of points, lines, angles, and figures in space from their defining conditions by means of certain assumed properties of space 16. Two rays with a common end point form an angle 17. A line in which falls on the other in such a way as to create congruent adjacent angles 18. A quadrilateral with two pairs of parallel sides 19. a continuous extent of length, straight or curved, without breadth or thickness; the trace of a moving point 20. A triangle that has one right angle 23. 180 degrees 24. A polygon having five sides 25. A polygon having eight sides 26. 360 degrees 27. A closed plane figure having three sides and three angles 28. the point farthest from the base 29. A rotation or translation of a plane figure that leaves the figure unchanged although its position may be altered

Down 1. The line segment between two points on a given curve 3. A solid bounded by six equal squares, the angle between any two adjacent faces being a right angle 4. A rectangle having all four sides of equal length 6. An instrument having a graduated arc for plotting or measuring angles 7. A triangle with no two sides of equal length 8. A straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end 11. A solid geometric figure generated by the revolution of a semicircle about its diameter 13. A triangle with two equal sides 15. A triangle that has all congruent angles 20. A parallelogram having four right angles 21. an angle that is 90 degrees 22. A quadrilateral plane figure having two parallel and two nonparallel sides