convertion:

• l = 10 ft
• w = 6 ft
• h = 4 ft

equation:

• A = 2 (w l + h l + h w)
• A = 2 [(6)(10) + (4)(10) + (4)(6)]
• A = 2 [ 60 + 40 + 24 ]
• A = 2 (124)
• A = 248

answer:

• The surface area of the rectangular prism is 248 ft