Answer:
Billy's prism will require more material by 30 square cm
Explanation:
Billy's Prism: 2cm, 8cm, & 10cm
2lw + 2lh + 2wh - Formula for Surface Area (l = length, w = width, & h = height)
2(2)(8) + 2(2)(10) + 2(8)(10)
= 32 + 40 + 160
= 232 cm squared
Charlie's Prism: 9cm, 5cm, & 4cm
2lw + 2lh + 2wh - Formula for Surface Area (l = length, w = width, & h = height)
2(9)(5) + 2(9)(4) + 2(5)(4)
= 90 + 72 + 40
= 202 cm squared
Billy's Prism - Charlie's Prism = 232 - 202 = 30 cm squared
So, Billy's prism will require more material by 30 square cm