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r=31,4/(3,14*2)
r=5
s^2-r^2=t^2
13^2-5^2=t^2
169-25=144=t^2
t=√144
t=12cm
caranya
r : kell/2.phi
r : 31,4/2.3,14
r : 31,4/6,28
r : 5 cm
t" : s" - r"
t" : 13" - 5"
t" : 169 - 25
t" : 144
t. : √144
t : 12 cm