Tolong bantu cari luas dan volume nya yah

a. Luas balok = 2(pl+pt+lt)
= 2(7.3 + 7.4 + 4.3)
= 2(21 + 28 + 12)
= 2(61)
= 122 cm^2

volume balok = p.l.t
= 7.3.4
= 84 cm^3

b. luas prisma = 2.luas alas + keliling alas.tinggi
= 2.5.12/2 + (5+12+13).15
= 60 + (30)15
= 60 + 450
= 510 cm^2

volume prisma = luas alas.tinggi
= 5.12/2 . 15
= 30.15
= 450 cm^2

c. luas alas prisma = 2.luas alas + keliling alas.tinggi
= 2.8.15/2 + (8+15+17).22
= 120 + (40)22
= 120 + 880
= 1000 cm^2

volume prisma = luas alas.tinggi
= 8.15/2.22
= 60.22
= 1320 cm^3

tolong di cek ulang. semoga membantu^^