geometry

2. The angle cut out of a piece of paper so that the paper can be rolled into a right circular cone
5. a line that touches a curve at only one point
6. a straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end
7. a quadrilateral with two pairs of adjacent sides with equal lengths
10. A triangle that has 2 equal sides
11. a polygon is scalene if its sides are all different lengths
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
13. The union of a circle and its interior
14. extending or lying across
15. In a right angle triangle the side of the triangle that is opposite to the right angle
16. a curve that is continuous and has endpoints that meet at the same point
20. covering of the plane, sometimes referred to as a tiling,referring to the way that tiles cover a floor

1. a triangle which all the sides are congruent
3. The meeting point of the three medians of a triangle. This point is the center of mass of the triangle
4. A segment that connects any vertex of a triangle to the midpoint of the opposite side
8. the boundary of a simple two-dimensional region,including shapes with straight and curved sides
9. ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle
17. polygon has no diagonal with points outside the polygon
18. A triangle that has no equal sides. All 3 sides are different lengths
19. Two points directly opposite each other on a sphere