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= 3/4 . 3,14 . 10²
= 3/4 . 3,14 . 100
= 3/4 . 314
= 235,5 cm²
keliling alas = 3/4 . 2 .π .r + 2 .r
= 3/2 .3,14 .10 + 2 .10
= 15 . 3,14 + 20
= 47,1 + 20
= 67,1 cm
L.permukaan = 2 x Lalas + kll alas x t
= 2 x 235,5 + 67,1 x 13
= 471 + 872,3
= 1343,3