Tolong jawab yang nomor 8&9.Pake Caranya!No asal!

8)
Luas Permukaan = (2 x Luas segitiga) + (Keliling segitiga x tinggi prisma)
L = (2 x 1/2 x 9 cm x 12 cm) + ((9 cm + 12 cm + 15 cm) x 11 cm)
L = 108 cm² + (36 cm x 11 cm)
L = 108 cm² + 396 cm²
L = 504 cm²

9)
D = 14 cm
r = D/2
  = 14 cm / 2
  = 7 cm
t = 8 cm
s = 14 cm
 
Volume = Volume tabung + Volume kubus
V = π.r².t + s³
V = (22/7 x 7 cm x 7 cm x 8 cm) + (14 cm)³
V = 1.232 cm³ + 2.744 cm³
V = 3.976 cm³