WHAT YOU NEED: a ruler, a compass and a pencil. STEP 2: Put the pin of a compass at the end of the line you want to bisect. Set the compass to more than half the length of the line, and draw an arc ...

WHAT YOU NEED: squared paper, a pen, a ruler and a compass. ...then repeat step 2: draw another square on top, turn anti-clockwise 90° and keep repeating with the squares getting bigger and bigger ...