Defining and Constructing Objects

Let's start by sketching an arbitrary plane and name it $P.$

Next, we should draw a line, called for example $l.$ Line $l$ is to intersect $P$ at only one point. Thus, $l$ can't be completely contained within $P.$ If the line was in the plane, they would intersect at infinitely many points. Thus, we can sketch $l$ as a line that intersects plane $P$ at exactly one point by letting it approach $P$ at an angle.