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= 1/3 x 3,14 x 10 x 10 x 24
= 2512 cm³
12. (maksudnya luas permukaan kerucut?)
Lsp kerucut = πr² + πrs
= (3,14 x 10 x 10) + (3,14 x 10 x 10)
= 314 + 314
= 628 cm²
13. Volume kerucut = 1/3 x πr² x t
= 1/3 x 5 x 5 x 4
= 942
14. Lsp kerucut = πr² + πrs
= (3,14 x 30 x 30) + (3,14 x 30 x 50)
= 2826 + 4710
= 7536 cm²
Lsp tabung = 2πr² + 2πrt
= (2 x 3,14 x 60 x 60) + (2 x 3,14 x 60 x 30)
= 22608 + 11304
= 33912 cm²
Lsp kerucut + Lsp tabung
= 7536 + 33912
= 41448 cm²
15. Volume kerucut = 1/3 x πr² x t
= 1/3 x 22/7 x 14 x 14 x 30
= 6160 cm³