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s= akar ( 8^2 + 6^2)
= akar ( 64+36)
= akar 100 = 10
L= 3,14 . 6.6 + 2. 3,14.6.10 + 3,14. 6.10
= 113,04 + 376,8 + 188,4
=678,24
Sisi kerucut
Luas selimut tabung
Luas permukaan bangun gabungan
Lp = Lp + Ls
=489,84 + 188,4
= 678.24 dm²
Jadi, luas permukaan bangun gabungan tersebut adalah 678.24 dm²