I Need Help so out of the kindness of your heart will you?

Question

surface areas and volume

1. find the surface area of the following solids
a. a cube with 10cm wide, 8cm depth, 4cm width

Answer 1

SA = 2(area of the base) + perimeter of the base * height
SA = 2(10 * 4) + 2(10+4) * 8
SA = 80 + 224
SA = 304 cm^2

V = Width * length * height
V = 10 * 4 * 8
V = 320 cm^3

Answer 2

A cube has 6 sides, 2 10by8s, 2 10by4s, and 2 4by8s
so to add them all will give the surface area. So;

2x8x10+2x10x4+2x4x8=160+80+64=304 cm^2 for surface area.

Volume is simply the 3 dimensions multiplied.

V=10x8x4 = 320 cm^3

Answer 3

The question is Wrong!

A cube consists of six squares

The solid that you are asking the surface area and volume of is a rectangular prism....

Surface Area:


Area of Top and bottom = 10*4*2 = 80 cm^2

Area of Sides = 10*8*2 + 4*8*2 = 224 cm^2

Hence surface area = 304 cm^2

Volume:

V = Area of the base * Height

= 10*4*8

= 320 cm^3

Hope it Helps!

Answer 4

You should really pay more attention in class.

A cube has six sides.
Draw it and label them.
After that is is just multiplication

Surface area = 2LW + 2WH + 2HW
where L, W, H = length, width, height
doesn't matter what mber you use for what you get
160 + 64 + 80 = 240 +64 = 304 cm^2

Volume = LWH = 320 cm^3

Also, your object is not a cube, a cube has all equal dimensions

Answer 5

1. surface area:

Answer: 10 * 4 or 40 sq cm

2. volume:

Answer: 10 * 8 * 4 or 320 cu cm