Geometry Vocab Review

12345678910111213141516171819202122232425262728293031323334353637383940
Across
  1. 7. divides into two equal parts.
  2. 10. next to each other
  3. 11. a four-sided plane closed figure with only one pair of parallel sides, called bases.
  4. 12. angles the opposite angles formed by the intersection of two lines. Vertical angles are equal in measure.
  5. 13. in a plane, the set of points all equidistant from a given point.
  6. 15. an angle whose measure is less than 90°.
  7. 17. the halfway point of a line segment, equidistant from each endpoint.
  8. 19. a four-sided plane closed figure having opposite sides equal and parallel. (Opposite angles are equal, and consecutive angles are supplementary.)
  9. 22. polygon a polygon in which all diagonals lie within the figure.
  10. 23. a triangle in which all three angles are equal in measure and all three sides have the same length.
  11. 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.)
  12. 30. angles that share a common side and a common vertex.
  13. 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.
  14. 33. altitude. From the highest point, a perpendicular drawn to the base.
  15. 34. a line crossing two or more parallel or nonparallel lines in a plane.
  16. 35. two angles the sum of which measures 180°.
  17. 37. angle an angle whose measure is equal to 90°.
  18. 38. a four-sided plane closed figure having opposite sides equal and parallel and four right angles.
  19. 39. the total distance around the outside of any polygon. The total length of all the sides.
  20. 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. 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. 2. lines two or more lines with the same slope. Parallel lines never meet.
  3. 3. a parallelogram with four equal sides.
  4. 4. a four-sided plane closed figure. The sum of its four angles equals 360°.
  5. 5. an angle greater than 90° but less than 180°; also describes a triangle containing an obtuse angle
  6. 6. exactly alike. Identical in shape and size.
  7. 8. having the same shape but not the same size, in proportion.
  8. 9. a plane closed figure with six sides and six angles.
  9. 10. the distance around a circle; equals 2 x π x radius or π x diameter (C = 2πr or πd.).
  10. 14. two angles the sum of whose measures is 90°.
  11. 16. in the same position. Coinciding.
  12. 18. capacity to hold, measured in cubic units. Volume of rectangular prism = length x width x height.
  13. 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.
  14. 21. 1-dimensional structure. Continues forever in one direction. Has one endpoint.
  15. 24. the point at which two rays meet and form an angle, or the point at which two sides meet in a polygon.
  16. 25. in a triangle, a line segment drawn from a vertex to the midpoint of the opposite side.
  17. 27. triangle a triangle having two equal sides (and thus two equal angles across from those sides).
  18. 28. triangle a triangle having none of its sides equal (or angles equal).
  19. 29. an angle equal to 180°. Often called a line.
  20. 32. in a right triangle, the side opposite the 90° angle.
  21. 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.