Answer:
See below.
Step-by-step explanation:
1) Rectangular prism
SA = (perimeter of base × height) + 2 × (area of base)
SA = (9 + 4 + 9 + 4) in. × 6 in. + 2 × 9 in. × 4 in.
SA = 228 in.²
2) Square pyramid
SA = 3 × (area of 1 triangular side) + (area of square base)
SA = 4 × 12 ft × 8 ft / 2 + (12 ft)²
SA = 336 ft²
3) Triangular pyramid
SA = 3 × 8 yd × 3 yd / 2 + 8 yd × 4√3 yd / 2
SA = 63.71 yd²
4) Cylinder
SA = 2 × πr² + 2πrh
SA = 2 × 3.14 × (7 in.)² + 2 × 3.14 × 7 in. × 9 in.
SA = 703.36 in.²
