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