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Across 3. the linear distance around the outside of a closed curve or circular object 4. quadrilateral with at least one pair of parallel sides 6. a three-dimensional solid object bounded by six square faces 8. straight line was introduced by ancient mathematicians to represent straight objects with negligible width and depth 10. -dimensional geometric shape that tapers smoothly from a base (usually flat and circular) to a point called the vertex. 11. a quantity that expresses the extent of a two-dimensional surface or shape, or planar lamina, in the plane. 13. a path that surrounds a two-dimensional shape 14. a simple (non self-intersecting) quadrilateral with two pairs of parallel sides 15. two planes perpendicular to the axis

Down 1. a way of writing numbers that are too big or too small to be conveniently written in decimal form (2 Words) 2. a number or ratio as a fraction of 100 5. part of a line which is finite in one direction 7. total area of the faces and curved surface of a solid figure (2 Words) 9. a part of a line that is bounded by two distinct end points (2 Words) 12. a line describes its steepness, incline, or grade