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r = √15² - 9²
r = 12cm
lp = la + ls
lp = 3,14 . 12² + 3,14 . 12 . 15
lp = 452,16 + 565,2
lp = 1017,36cm²
r : s² + t²
: 15² + 9²
: 225 + 81
; 306cm
luas permukaan kerucut : πrs + πr²
:( 3.14 x 306 x 15 ) + (3.14 x 306²)
14.412,6 + 294.017,04
; 308.429,64 cm