# geometry

##### Across
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
##### Down
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