Geometry: Using compasses to draw a perpendicular line

Here we learn how to draw a perpendicular line using the compasses we use for drawing circles – that’s geometry for you!


 Lightly draw the first arc centred on point A


Then repeat the arc but centred on point B – with compasses set to the same radius as they were at A


Draw a line from one intersection to the other and it will be perpendicular to line AB



You can try another radius for the compasses but the result is the same!

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