### Video Transcript

Complete using “parallel” or
“perpendicular”: The two red-colored lines are what.

This is an interesting four-sided
shape, isn’t it? You might not know the name of it,
but it doesn’t matter, because in this question, all we need to think about are the
two red-colored lines that we can see that make up the sides of the shape, here and
here. Now, we need to describe these two
lines. And we’re told that we have to
complete the sentence using either the word “parallel” or “perpendicular.” Do you remember what these two
words mean?

Parallel lines are always the same
distance apart. They can never ever cross. But perpendicular lines do
touch. In fact, they meet at right
angles. And if we look at our two
red-colored lines, we can see straightaway that they don’t meet at right angles. In fact, they’re not touching at
all, are they? They must be the same distance
apart. Now, if we look at the top and the
bottom of the two red lines, it does look like they’re the same distance apart. But without a ruler, how can we
tell?

Well, there’s a clue in the
picture. We know that whenever we see a pair
of lines labeled using arrow heads like this, they are parallel. So we can see that they’re the same
distance apart. But we can also see that they’ve
been labeled to show this. The two red-colored lines are
parallel.