tolong yaa kak.......................

d = 20 cm = R = 10 cm
t = 24 cm

A) Lp tanpa tutup = πR(R + 2t)
                          = (3,14)(10)(10 + 2(24))
                          = (31,4)(10 + 48)
                          = (31,4)(58)
                          = 1.821,2 cm²

B) Lp dengan tutup = 2πR(R + t)
                             = 2(3,14)(10)(10 + 24)
                             = (62,8)(34)
                             = 2.135,2 cm²