Identify in a rectangle
Look around — train tracks, the corner of a book, the rungs of a ladder. Lines have special relationships. Today we'll learn two of them.
First, watch these two lines. They run side by side, always staying exactly the same distance apart.
We call these parallel lines. Even if they kept going forever, they would never, ever cross.
We mark parallel lines with little matching arrows so we remember they're a pair.
Now look at a different pair. These two lines cross right in the middle.
But not just any crossing — they make a perfect square corner. We mark it with a tiny square.
That square corner is called a right angle, and lines that meet this way are perpendicular.
Now look at this rectangle. Let's find both in a shape you already know.
The top and bottom sides never get closer or farther apart, so they are parallel.
And every corner is a right angle, so the sides that meet are perpendicular.
Parallel lines never meet. Perpendicular lines meet at a right angle. A rectangle has both — nice work!
Now you try. Name this shape from the list. Which shape is this?