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16^2 = 20^2 - (r1+9)^2
(r1+9)^2 = 20^2 - 16^2
(r1+9)^2 = 400 - 256
(r1+9)^2 = 144
(r1+9)^2 = 12^2
r1+9 = 12
r1 = 12 - 9
r1 = 3cm
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