Calculating whether I had enough paint to decorate a room in my house ! I had to work out what size tin of emulsion to get. Since the estimated coverage of the tin of paint is displayed on the label - knowing the area I wanted to paint enabled me to buy the correct size of tin.
Additionally - calculating the area of carpet required for the newly-painted room ensured I didn't have too much left over after I cut it to fit !
The surface area is the sum of all the shapes' area
Now that depends on if you mean outside surface area. A cone has an inside surface area too. Just adding my two cents. Not even good at math. But I can debate a point til the death!
math
surface area
math you silly goose
LxW
Yes, area is always squared in math. I know this because I asked my math teacher ( who is the best math teacher ever!)
It depends on what shape you are talking about.
Calculating volume and surface area.
length times the width
In: Math, Geometry [chemistry]
Length times the Width times height