d=8dm
r=1/2d=1/2 *8=4dm
O=2pir
O=2*4*pi=8pidm
P=pir^2
P=4^2pi=16pidm^2
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d=8dm
r=1/2d=1/2 *8=4dm
O=2pir
O=2*4*pi=8pidm
P=pir^2
P=4^2pi=16pidm^2