##### Across

**2.**A rectangle with four equal sides and four right angles.**4.**The amount of space inside a three-dimensional shape.**9.**A closed shape made up of straight lines.**10.**A closed shape where every point on its boundary is equidistant from its center.**11.**Two lines or planes that intersect at a right angle.**14.**A three-dimensional shape where every point on its surface is equidistant from its center.**15.**The distance around the edge of a two-dimensional shape.**16.**A three-dimensional shape with two circular bases and a curved surface.**17.**A change in the position, size, or shape of a geometric figure.**18.**The space between two intersecting lines or surfaces measured in degrees or radians.**19.**The amount of space inside a two-dimensional shape.

##### Down

**1.**Two or more lines that never meet.**3.**A parallelogram with four right angles.**5.**A straight, one-dimensional figure that extends infinitely in both directions.**6.**A three-dimensional shape with a circular base and a pointed top.**7.**A precise location in space represented by a dot.**8.**A polygon with three sides and three angles.**12.**Having the same shape and size.**13.**A point where two or more lines or edges meet.**16.**A set of numbers that locate a point in space, usually represented by (x, y) or (x, y, z) for three-dimensional space.