Pc = πr²+πrl
2πr=62,8/:2*3,14
r=10
z tw. Pitagorasa:
r²+h²=l²
10²+15²=l²
l²=325
l=5√13
Pc=3,14*100+3,14*10*5√13
Pc=314+31,4*5√13=157(2+√13) cm²
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Pc = πr²+πrl
2πr=62,8/:2*3,14
r=10
z tw. Pitagorasa:
r²+h²=l²
10²+15²=l²
l²=325
l=5√13
Pc=3,14*100+3,14*10*5√13
Pc=314+31,4*5√13=157(2+√13) cm²