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r=9
h= a√3/2
h= 18√3/2=9√3
h²+r²= l²
(9√3)² + 9²= l²
243+81=l²
l²= 324
l= 18
Pp= πr²
Pp= 81π
V= ¹/₃* 81π * 9√3
V=243√3 π