-GEOMETRY-

123456789101112131415
Across
  1. 3. the 90 degree angle between two perpendicular lines
  2. 6. the length of the closed curve of a circle
  3. 9. a quadrilateral whose opposite sides are parallel and equal
  4. 10. ration of the opposite side to the adjacent of a right-angled triangle
  5. 12. bigger than a right angle
  6. 14. a surface generated by rotating a line around a fixed line
Down
  1. 1. the surface measurement
  2. 2. Segment of straight line joining one summit of a triangle to the middle of the opposite side.
  3. 4. smaller than a right angle
  4. 5. angle whose measure is 180 degrees
  5. 7. parallelogram with consecutive sides congruent
  6. 8. ratio of the adjacent side to the hypotenuse of a right-angled triangle
  7. 11. a quadrilateral with one pair of parallel sides
  8. 13. line that intersects a circle in two points
  9. 15. a segment which join the center to a point on the circle