Jawabanmu

2014-06-09T21:09:23+07:00
TΔ = 10² - 6² = 100-36
                  = √64 = 8 cm

V prisma = La x t
V prisma = 1/2 x 8 x 12 x 20
V prisma = 4 x 12 x 20 = 960 cm³
2014-06-09T21:10:30+07:00
V prisma= La.t
= ((8.6):2) .20
= 24.20
=480