Answer:
≈1130.97336 yd
Explanation:
the formula to find the surface is A= 2 π r h + 2 π r 2
where r is the radius and h the height. you subsitute it with your value.
r = 9 yd and h = 11 yd
so, A= 2 π r h + 2 π r 2 = 2 x π x 9 x 11 + 2 x π x 9^2 ≈ 1130.97336 yd