1. 2. The angle cut out of a piece of paper so that the paper can be rolled into a right circular cone
  2. 5. a line that touches a curve at only one point
  3. 6. a straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end
  4. 7. a quadrilateral with two pairs of adjacent sides with equal lengths
  5. 10. A triangle that has 2 equal sides
  6. 11. a polygon is scalene if its sides are all different lengths
  7. 12. the trigonometric function that is equal to the ratio of the side adjacent to an acute angle (in a right-angled triangle) to the hypotenuse
  8. 13. The union of a circle and its interior
  9. 14. extending or lying across
  10. 15. In a right angle triangle the side of the triangle that is opposite to the right angle
  11. 16. a curve that is continuous and has endpoints that meet at the same point
  12. 20. covering of the plane, sometimes referred to as a tiling,referring to the way that tiles cover a floor
  1. 1. a triangle which all the sides are congruent
  2. 3. The meeting point of the three medians of a triangle. This point is the center of mass of the triangle
  3. 4. A segment that connects any vertex of a triangle to the midpoint of the opposite side
  4. 8. the boundary of a simple two-dimensional region,including shapes with straight and curved sides
  5. 9. ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle
  6. 17. polygon has no diagonal with points outside the polygon
  7. 18. A triangle that has no equal sides. All 3 sides are different lengths
  8. 19. Two points directly opposite each other on a sphere