Video Transcript
Complete using “parallel” or
“perpendicular”: The two red-colored lines are what.
In this question, we’re given a
picture of a shape, and two of its sides are colored red. Now, how can we describe these two
red-colored lines? Are they parallel? Or are they perpendicular? We know that when two lines are
parallel, they’re always the same distance apart. So if we think about this red line
here to begin with, a line that’s parallel to this line might look like this, or
even this. Or if we look at the red line at
the bottom of our shape, a line that’s parallel to this might look like this or even
this.
But when we look at the two lines
together and compare them, we can see that they’re not parallel with each other at
all, are they? Just like two railway tracks,
parallel lines never touch. But we can see that these two lines
do touch. In fact, where they meet, a little
symbol’s been drawn. Do you remember what this symbol
means? It’s the symbol we use to show a
square corner or a right angle. And we know that the word we use to
describe a pair of lines that meet at a right angle is “perpendicular.” These two sides of the shape meet
at a right angle. And so we can say the two
red-colored lines are perpendicular.
