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b) P=625 pi cm²
P=π*r^2
Obwód koła
Ob=2πr
π=3,14
a) Ob= 14 π dm
Ob=2πr
14π=2πr
14*3,14=2*3,14*r
43,96=6,28r/:6,28
r=7dm
P=π*r^2
P=3,14*7^2
P=3,14*49
P=153,86 dm kw.
b)50 π cm
Ob=2πr
50π=2πr
50*3,14=2*3,14*r
157=6,28r/:6,28
r=25cm
P=π*r^2
P=3,14*25^2
P=3,14*625
P=1962,5 cm kw.