Today in class I was assigned question 9 to do for the blog.
Examine the bookshelf. It is constructed of thin hardwood. The top, bottom, and all three shelves are the same size. There is an equal distance between the top, the shelves, and the base.
a) What is the surface area of one shelf?
A= l x w (2)
A= 90 x 24 (2)
A= 4 320 cm
You have to multiply by two because theres both a top and bottom in the smaller inside shelf.
b) What is the total surface area of the bookcase?
For the tops and undersides of the entire bookshelf you have to go Length x Width x 10
I got the 10 because there are 5 identical surfaces (add both sides of them equals 10)
The sides of shelves (There are 2 but you have to do both sides)
120 x 24 x 4 = 11 520cm
The very back of the shelf (Multiplied by 2 both sides)
90 x 120 x 2 = 21 600
You add all of the pieces together :
TSA= 21 600+11 520+21 600
TSA= 54 720cm