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Pb=πrl
l=4cm
r=?
z tw. Pitagorasa:
l²+l²=(2r)²
2l²=4r²
r²=½l²
r²=½*(4cm)²
r²=½*16cm²
r²=8cm²
r=2√2cm
Pb=π*2√2cm*4cm=8π√2cm²