Answer:
[tex]\large \boxed{\sf below}[/tex]
Step-by-step explanation:
a. Square-based pyramid has more surface area because area of square is double the area of triangle.
b. Surface area of square-based pyramid:
[tex]14 \times 4 \times 0.5 \times 8 + 8^2=288[/tex]
Surface area of triangle-based pyramid:
[tex]14 \times 4 \times 0.5 \times 6 + 6.9 \times 4 \times 0.5 \times 2=195.6[/tex]
Surface area of square-based pyramid is more than surface area of triangle-based pyramid.
