ABC.DEF merupakan prisma dengan alas segitiga ABC. perbandingan Ab:BC:BE=3:4:5hitunglah panjang rusuk prisma jika volume 240cm^3

V = 1/2 x a x b x tinggi
240 = 1/2 x 3n x 4n x 5n
240 = 30n^3
n^3 = 240/30
n^3 = 8
n = 2

AB = 3n = 3x2 = 6 cm
BC = 4n = 4x2 = 8 cm
BE = tinggi = 5n = 5x 2 = 10 cm

BC^2 = 6^2 + 8^2
BC^2= 36+64
BC^2 = 100
BC =√100
BC = 10 cm

panjang rusuk prisma =
2x ( 6+8+10) + (3 x10)
= 2 x 24 + 30
= 48 + 30
= 78 cm