Please choose the correct solution to the question: How do I draw a 45 cm diameter circle on the leather ?

Solution1: Cut a 22.5 cm string with scissors, fix one end on the string  on the leather with you left hand and grab the other end of the string with your right hand while holding a pencil. By tensing up the string, draw a circle with your right hand.

Solution2: Cut a 22.5 cm string with scissors, fix one end on the string  on the leather with you left hand and grab the other end of the string with your right knee while holding a pencil. By tensing up the string, draw a circle with your right knee.

Answer format: solution1/solution2