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r tabung = r kerucut = 12/2= 6 dm
Lp Tabung tanpa tutup = πr (r+2t)
Lp Tabung tanpa tutup = 3,14 x 6 (6+2 x 10)
Lp Tabung tanpa tutup = 18.84 x 26
Lp Tabung tanpa tutup = 489,84 dm persegi
S= apotema/sisi miring kerucut
S kuadrat = t kerucut kuadrat + r kerucut kuadrat
S kuadrat = 8 kuadrat + 6 kuadrat
S kuadrat = 64 + 36
S kuadrat = 100
S = √100
S = 10 dm
Lp Kerucut tanpa alas = πrs
Lp Kerucut tanpa alas = 3,14 x 6 x 10
Lp Kerucut tanpa alas = 188,4 dm persegi
Lp Total = Lp Tabung + Lp Kerucut
Lp Total = 489,84 + 188,4
Lp Total = 678,24 dm persegi
678,24 dm persegi dijadikan cm persegi
dm persegi ke cm persegi turun satu tangga berati dikali 100
678,24 dm persegi = 678,24 x 100 = 67.824 cm persegi (A)