Question

Need help with two questions please!

http://puu.sh/hDlnJ/68b563f80c.png

Answer 1

For #7 :

Surface area = \(\pi r^2+\pi r\sqrt{r^2+h^2}\)

plugin the given values and simplify

Answer 2

#8 the cone is base down surface area =pi*r*slant height =pi*37*s=555*pi
s=555pi/(pi *37)=15
#7 required a top on the store whereas #8 did not

Answer 3

number 7 is C.