r = 54/ 2 = 27
a√3/2 = 27
a√3 = 27/2
a = 27/2/√3
a = 81/2√3 = H
V = Pp x H./ 3
Pp = πr² = 729π
V = 729π x 81/2√3/ 3 = 243 x 81/2√3 = 19 683/2√3
19 683/2√3 x 2√3 /2√3 = 39 366√3/12 = 3280,5√3 cm³
Pc = Pp + πrl
l = 2πr = 54π
Pc = 729 + 1458 = 2187 cm ²
