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r=15cm
h=20cm
l=?
z twierdzenia Pitagorasa obliczamy l
h²+r²= l²
400+225=l²
l²=625
l=25
podstawiamy pod wzór na pole całkowite
Pc= π15²+π15*25= 600π cm²
h² + r² = l²
400 + 225 = l²
l² = 625
l= 25
Pc= π 15² +π 15*25= 225 π+ 375π= 600π cm²