-- From there, move 1 unit to the right and 2 units up and make a mark. If this is too tiny for you, then you can move 7 units to the right and 14 units up, or 11 units to the right and 22 units up ... any way you want to do it, as long as the distance 'up' is double the distance to the right, because the slope is 2 to 1. Wherever you wind up, mark a dot.
-- Using your pencil and your ruler, draw a straight line between the two dots you have marked. You may extend it as far as you wish in either or both directions.
A cross section is the shape we get when cutting straight through an object. In geometry it is the shape made when a solid is cut through by a plane. cylinder cross section.The cross section of this circular cylinder is a circle.