Diagonal lines that meet to make a right angle are perpendicular
Perpendicular linesPerpendicular lines come in pairs. We call lines perpendicular when they are at right angles to each other. You can find out all about right angles on page 232.
When horizontal and vertical lines like these meet, we say
they are perpendicular to each other. We call the point where they meet a right angle.
Look at this picture of a rocket on a launch pad. You can see
horizontal, vertical, and diagonal lines. Some of the lines are perpendicular.
We use a corner
symbol like this to mark a right angle.
GEOMETRY
PERPENDICULAR LINES
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