Jawabanmu

2014-07-20T09:03:25+07:00
A. Tinggi prisma
Lp = La x 2 + ka x t
84 = (4 x 3 x 1/2) x 2 + (3 + 4 + 5) x t
84 = (6 x 2) + (12 x t)
84 = 12 + (12 x t)
(12 x t) = 84 - 12
(12 x t) = 72
t = 72 : 12
t = 6 cm

B. Volume prisma
V = la x t
V = 6 x 6
V = 36 cm³

Ket:
Lp = luas permukaan
La = luas alas
Ka = keliling alas
t = tinggi
V = volume