# Maths

##### Across
1. 2. extending in the same direction, everywhere equidistant, and not meeting
2. 4. a never stopping line in one direction origination from one point
3. 6. An equation that may be expressed as Ax2 + Bx + C = 0.
4. 9. passing through two nonadjacent edges of a polyhedron
5. 13. an element of a mathematical set that when multiplied by a given element yields the identity element
6. 17. a number obtained when a number is multiplied by itself 3 times
7. 18. a quadrilateral with each pair of opposite side parallel and having 90 degree angles
8. 20. a subject involving geometry and algebra
##### Down
1. 1. number that can be expressed as a sum of two cubes
2. 3. rectangle with all four sides equal
3. 5. a letter taking place of a unknown varying number
4. 7. The square root of a negative number.
5. 8. a polygon of four sides
6. 10. A method used for multiplying binomials in which the first terms, the outside terms, the inside terms, and then the last terms are multiplied.
7. 11. simple closed curve which divides the plane into two regions: an interior and an exterior
8. 12. a polyhedron that has four faces
9. 14. an equality true for every value of the variable in it
10. 15. interval between two points and claimed it could be extended indefinitely in either direction.
11. 16. of the same measure, quantity, amount, or number as another
12. 19. a polygon having three sides