answer:
104π or 326.56 inches^2
step-by-step explanation:
- know the surface area formula for a cylinder
- once you know that plug in the numbers given
formula: 2πrh+2πr^2
- r stands for radius
- h stands for height
- π stands for pi
- now that you know that, plug in
2πrh+2πr^2
2π(4)(9) + 2π(4)^2
72π + 32π
104π
- the answer would be 104π inches^2
- you can further solve this by multiplying by 3.14 instead of putting π
