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πr²=25π cm²
r²=25 cm²
r=5cm promien
2π*(5cm)² + 2π*5cm*20cm=50π cm² +200π cm²=250π cm²
πr²H=500π
r²H=500
r²×20=500
20r²=500 /÷20
r²=25 /√
r=5
Pc=2πr²+2πrH
Pc=2×π×25+2×π×5×20
Pc=50π+200π
Pc=250π
Odp. Pole całkowite wynosi 250π