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P=πr²=π4²=16πcm²
2. P=36cm²
a=6cm
d=a√2=6√2cm
r=6√2:2=3√2cm
P=πr²=π*(3√2)²=π*9*2=18πcm²
3.
a=10cm
d=10√2
r=5√2
dalej nie doszłam do tego jak to obliczyć..