Cutting long lengths using two rulers

Placing the two rulers side by side, slide them so that they pass through the corner points of the square as shown.

Using the rotary cutter carefully cut along the diagonal until you have passed the halfway point 

With your right hand hold the smaller ruler in place as you slide the long ruler beside it until it passes the upper corner.

Discard the smaller right hand ruler and complete the diagonal cut through the top corner.

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