Question

2.) Find the surface area of each of the following:

see images

Answer 1

I got 90cm^2 for a. and \[600pift ^{2}\] for b. can someone tell me if I did this correctly?

Answer 2

a)(1/2)(2.5+2.5)(6.5)(4) + (5x5)=90
b) 20 pi x 60 + (1/2)4 pi (10)^2 = 1400 pi

Answer 3

ok so our a. matches, now I have to take a look at b. again

Answer 4

so \[\pi r ^{2} + 2\pi rh + 1/2(4\pi r ^{2}) \] isn't correct? I keep getting 1600. I am so confused.