##### Across

**2.**extending in the same direction, everywhere equidistant, and not meeting**4.**a never stopping line in one direction origination from one point**6.**An equation that may be expressed as Ax2 + Bx + C = 0.**9.**passing through two nonadjacent edges of a polyhedron**13.**an element of a mathematical set that when multiplied by a given element yields the identity element**17.**a number obtained when a number is multiplied by itself 3 times**18.**a quadrilateral with each pair of opposite side parallel and having 90 degree angles**20.**a subject involving geometry and algebra

##### Down

**1.**number that can be expressed as a sum of two cubes**3.**rectangle with all four sides equal**5.**a letter taking place of a unknown varying number**7.**The square root of a negative number.**8.**a polygon of four sides**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.**11.**simple closed curve which divides the plane into two regions: an interior and an exterior**12.**a polyhedron that has four faces**14.**an equality true for every value of the variable in it**15.**interval between two points and claimed it could be extended indefinitely in either direction.**16.**of the same measure, quantity, amount, or number as another**19.**a polygon having three sides