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18.840= 1256xt
18.840/1256=t
15=t
la = phi x r x r
1256 =3.14 x r x r
400 = r x r
20 = r
lp = 2luas alas + keliling alas x t
lp = 2x1256 + (phi x 2r) x t
lp = 2512 + (3.14 x 2x 20) x 15
lp = 2512 + 1884
lp = 4396 (A)
= 1256.t
18.840 /1256 = t
t = 40 cm
Lo = 1.256 cm² =
1256 =
1.256 : 3,14 = r²
400 = r²
r = √400
r = 20 cm
Ditanya : Lp tabung = ?
Jawab : Lp = 2.Lo + L selimut
Lp = 2.1256 + 2..d.t
Lp = 2512 + 2 . 3,14 . 40 .40
Lp = 2512 + 10.048
Lp = 12.560