tolong bantuannya beserta cara

SMP/MTK/UN*m
Jawaban:
L1 = 2 pi r (r+t)
= 2 pi r^2 + 2 pi rt
L2 = 2 pi r (2r + 2t)
= 4 pi r^2 + 4 pi rt
= 2 (2 pi r^2 + 2 pi rt)
= 2 (132)
= 264