I REALLY need help on this problem, :/ I've found a whole bunch of different formulas and ended up getting every single option given. .

Question

I REALLY need help on this problem, :/
I've found a whole bunch of different formulas and ended up getting every single option given. >.<

May you walk me through this?

@ganeshie8 
@Directrix

ganeshie8 · Answer

how many faces it has ?

ganeshie8 · Answer

top is a circular disk - thats one face

ganeshie8 · Answer

and the rest of it is a half sphere, right ?

ganeshie8 · Answer

find the surface area of each face and addup

anonymous · Answer

1 face.  SA of each face!

ganeshie8 · Answer

Lets calculate the area of top face :

Notice that the circle has a radius of `6cm`

Area of circle = $\pi r^2 = \pi (6)^2 = ?$

anonymous · Answer

For the Curved Surface Area of Hemisphere : 226. 08

and for Total Surface Area of Hemisphere : 339.12

anonymous · Answer

Area of circle = 113.1

-All of those are options, that's why I'm confused!

ganeshie8 · Answer

Excellent !

ganeshie8 · Answer

You want to cover the entire thing right ?

anonymous · Answer

Well it says completely, so yes the entire thing..

ganeshie8 · Answer

So total area of silver foil required =  area of circle + area of hemisphere
                                                       = 113.1 + 226.08
                                                        = ?

anonymous · Answer

= 339. 18 !

ganeshie8 · Answer

Correct !

anonymous · Answer

Great, thanks.
I have a few more, do you think you could help me?

ganeshie8 · Answer

I'll try...