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A Rod and a Pole

Stage: 2 Challenge Level: Challenge Level:2 Challenge Level:2

A lady has a steel rod that she knows to be exactly $3$ units long, and a wooden pole that she knows is exactly $13$ units long. Her only tools are a pencil and a saw.

Steel rod, wooden pole, saw and pencil.

She needs an $8$ unit long wooden pole. She finds that is not possible to mark the steel rod, but she can draw on the wooden pole.

How can she measure out the $8$ unit pole?