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Nomer 5 Luas permukaaan prisma = 2xLuas Alas + luas selimut
Luas alas = 1/2 x diagonal1 x diagonal2 .= 1/2 x 16 x 12
= 96 cm^2
s^2 = (1/2 x diagonal1)^2 + (1/2 x diagonal2)^2
....= 8^2+ 6^2
....= 64 + 36
...= 100
s = akar 100
...= 10 cm
Keliling alas = 4s = 4(10) .= 40 cm
Luas selimut = Keliling alas x tinggi
= 40 x 12 = 480 cm^2
Luas permukaan = 2 x luas alas + luas selimut
= 2 x 96 + 480 = 192 + 480 = 672 cm^2
Nomer 7
salah satu sisi tegak = 30
volume prisma = luas alas x tinggi
30000 = luas alas x 50
luas alas = 600
1/2 30 x X = 600
Sisi tegak yang lain = 40
sisi miring = 50
luas permukaan prisma adalah
= 2 x luas alas + (sisi tegak 1 x tinggi) + (sisi tegak 2 x tinggi) + (sisi miring x tinggi)
= 2 1/2 30 x 40 + (30 x 50) + (40 x 50) + (50 x 50)
= 1200 + 1500 + 2000 + 2500
=7200 cm^2