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r= d/2 (d to średnica)
r=14/2
r=7
l= 27
l= 2*7*
l=14
l=14*3,14
l=43,96
2) l=2r
l=2*20*
l=40
l=40*3,14
l=125,6 cm
P=r
P= 20²
p= 400
p=400 cm²
r= 1/2*14=7
P=pi*r^2
P=7^2* pi
P=49 pi cm
L= 2 pi* r
L=2*7* pi
L=14 pi cm