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49π=πr² |:π
49=r²
r=7cm
d=2r
d=7cm*2
d=14cm
pi*r2= 49 pi2/;pi
r2=49*2 / wyciagnac pierwiatek
r=7
d= 14
P= 49π
49π=πr²/π
r²=49
r=7
średnica=2razy r=2 razy 7=14 cm