Jawabanmu

2014-05-30T13:38:10+07:00
A.
6 rusuk alas = 3000/25 = 120
rusuk alas = 120/6 = 20 cm
b.
luas alas = 6 . 1/2 . 20 . 20 . 1/2 √3 = 600√3
volumenya = 600√3 . 25 = 15000√3 cm³
2014-05-30T13:39:57+07:00
Tprisma = 25 cm
jumlah luas sisi tegak = 3000
a. rusuk alas = ...?
Jumlah luas sisi tegak = 6.tprisma.rusuk alas
3000 = 6.25.rusuk alas
rusuk alas = 3000.1/6.1/2
rusuk alas = 20 cm
b. volume
luas alas = 6segitiga
tinggi segitiga = √20²-10²
=√400-100
=√300
= 10√3
volume = Lalas.tprisma
=6.1/2.a.tsegitiga.tprisma
=6.1/2.20.10√3.25
= 21000√3