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Diketahui prisma dengan alas segitiga sama sisi. panjang rusuk alas 6cm dan tinggu prisma 11cm. volume prisma?
Adlh
2 Answers
- ?Lv 67 years agoFavorite Answer
volume prisma = Luas alas x tinggi
kalau mencari luas alas memakai cara trigonometri
La = akar dari s (s-a) (s-b) (s-c) ==> s = 1/2 kll (kll = 6 +6+6 = 18, s = 9)
La = akar dari 9 (9-6) (9-6) (9-6)
La = akar dari 9 x 3 x 3 x 3
La = akar dari 243
La = 9 akar 3
V = la x t
V = 9V3 x 11
V = 99V3 (99 akar 3)
jadi volume prisma tersebut adalah 99 akar 3 cm^3
Source(s): Hitungan sendiri & pelajaran disekolah - 7 years ago
tinggi segitiga alas = â(6^2 - 3^2) = 3 â3
luas alas = 0,5 * 6 * 3â3 = 9 â3
volum prisma = 9 â3 * 11 = 99 â3
