1.
SA and V of 3x4x5 right rectangular prism.
Three pairs of faces, 3×4, 4×5, 3×5, so area
SA = 2(3×4 + 4×5 + 3×5) = 94 sq ft
V = L×W×H = 3×4×5 = 60 cubic ft
Answer: D. SA 94 sq ft, V 60 cu ft
2. Right triangular prism, base legs 3x4, height 7
Two triangular faces, combined area 2×(1/2)×3×4=12, and three rectangular faces, 3x7, 4x7 and 5x7
SA = 12 + 7(3+4+5) = 8(12) = 96
Volume is area of base times height, so (1/2)(3)(4)(7)=42.
Answer: I. SA 96 sq cm, V 42 cu cm
