Across
- 7. divides into two equal parts.
- 10. next to each other
- 11. a four-sided plane closed figure with only one pair of parallel sides, called bases.
- 12. angles the opposite angles formed by the intersection of two lines. Vertical angles are equal in measure.
- 13. in a plane, the set of points all equidistant from a given point.
- 15. an angle whose measure is less than 90°.
- 17. the halfway point of a line segment, equidistant from each endpoint.
- 19. a four-sided plane closed figure having opposite sides equal and parallel. (Opposite angles are equal, and consecutive angles are supplementary.)
- 22. polygon a polygon in which all diagonals lie within the figure.
- 23. a triangle in which all three angles are equal in measure and all three sides have the same length.
- 26. a line segment that contains the center and has its endpoints on the circle. Also, the length of this segment. (A chord through the center of the circle.)
- 30. angles that share a common side and a common vertex.
- 31. a line segment whose endpoints lie one at the center of a circle and one on the circle. Also, the length of this segment.
- 33. altitude. From the highest point, a perpendicular drawn to the base.
- 34. a line crossing two or more parallel or nonparallel lines in a plane.
- 35. two angles the sum of which measures 180°.
- 37. angle an angle whose measure is equal to 90°.
- 38. a four-sided plane closed figure having opposite sides equal and parallel and four right angles.
- 39. the total distance around the outside of any polygon. The total length of all the sides.
- 40. a three-dimensional shape bounded by congruent parallel faces and a set of parallelograms formed by joining the corresponding vertices of the bases.
Down
- 1. a theorem that applies to right triangles. The sum of the squares of a right triangle's two legs equals the square of the hypotenuse (a^2 + b^2 = c^2).
- 2. lines two or more lines with the same slope. Parallel lines never meet.
- 3. a parallelogram with four equal sides.
- 4. a four-sided plane closed figure. The sum of its four angles equals 360°.
- 5. an angle greater than 90° but less than 180°; also describes a triangle containing an obtuse angle
- 6. exactly alike. Identical in shape and size.
- 8. having the same shape but not the same size, in proportion.
- 9. a plane closed figure with six sides and six angles.
- 10. the distance around a circle; equals 2 x π x radius or π x diameter (C = 2πr or πd.).
- 14. two angles the sum of whose measures is 90°.
- 16. in the same position. Coinciding.
- 18. capacity to hold, measured in cubic units. Volume of rectangular prism = length x width x height.
- 20. polygon a polygon in which sides and angles are all equal. For example, a regular pentagon has five equal angles and five equal sides.
- 21. 1-dimensional structure. Continues forever in one direction. Has one endpoint.
- 24. the point at which two rays meet and form an angle, or the point at which two sides meet in a polygon.
- 25. in a triangle, a line segment drawn from a vertex to the midpoint of the opposite side.
- 27. triangle a triangle having two equal sides (and thus two equal angles across from those sides).
- 28. triangle a triangle having none of its sides equal (or angles equal).
- 29. an angle equal to 180°. Often called a line.
- 32. in a right triangle, the side opposite the 90° angle.
- 36. an angle formed outside the polygon by extending one side. In a triangle, the measure of an exterior angle equals the sum of the measures of the two remote interior angles.