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obliczamy a z wzoru na objetosc
V=a^3
216 = a^3 => a =6
obliczmay wysokosc sciany bocznej ostroslupa z pitagorasa( tutaj pojawia si etrojkat pitagorejski) 3 4 to przeciwprostokatna jest 5
liczymy Pc = 5*36 + 4* 0.5* 6 * 5 = 240 cm^2