L = πr^2 + 2πrt + πrs
L = πr^2 + 2πrt + πr Vt^2 + r^2
L = πr (r+2t + Vt^2 + r^2)
V = V tabung + V kerucut
= 3/3 πr^t + 1/3 πr^2 t
= 4/3 πr^t
Baca Juga: Latihan Soal Ulangan Penilaian Harian IPA Kelas 9 Bab 6, Kemagnetan dan Pemanfaatannya
b. L = Ls tabung + 2x Ls kerucut
= 2 πrt + 2.πrs
= 2 πrt + 2.πr (Vt^2 + r^2