## Thursday 17 April 2014

### Maths: how to draw a perpendicular line

To draw a perpendicular line at any point on a straight line is easy when you know how and all you will need is a piece of paper, a pencil, a pair of compasses and a ruler.

Here is how it is done in 5 easy steps...

STEP ONE

Draw a line to the length you need and mark on it where you want your perpendicular line to be.

STEP TWO

Set you compass so it is open at about 1 to 2 cm wide (now need to be incredibly accurate at this stage) and use your compass to make a semi circle like this on the straight line...

I have marked one point A and the other B to make it easier to understand the next stages.

STEP THREE

Open your compass so that it is a little wider, 3 to 4cm wide.

STEP FOUR

Putting your compass on the point I've marked A, make a mark with the compass.  Do the same again but at point B. Look at the above photo to see what I mean.

STEP FIVE

Where the two curved lines that you made in STEP FOUR meet, draw a line from that point through to the first point you marked off in STEP ONE, Like this...

YOU'RE DONE, IT'S THAT SIMPLE!!!!
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