kak tolongin pleas.. pakai caranya ya..

L = 2L.alas + K alas. t
= 2. 3,14. (10cm)^2 + 2. 3,14 10 cm 10cm
= 628cm^2 + 628cm^2
= 1256 cm^2 (B)

2 [tex] \pi r^{2} [/tex] + [tex] \pi d t[/tex]
= 2 x 3.14 x 10 x 10 + 3.14 x 20 x 10
=  628 + 628
= 1256