How_To_Be_Good_At_Math

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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