## Tuesday, April 15, 2008

Finding the surface area of a cube and a rectangular prism,needs the illustration of the net and solve the problem based on the formula. in getting the volume also need formula. good thing in cubes are that they have same sides.

To represent this objects, we need to illustrate 3d images

Getting the surface area of a cube.

3d cube SA formula of the surface area of a cube

Solution in getting the surface area of a cube. i did this because it is easier. since cube has 6 sides with equal area, i multiplied each side with the same area to the number of sides that make up a cube.

Net of a cube

Getting the
volume of a cube

formula of getting the volume of a cube. It can also be used in a rectangular prism.

the area of the base times height is commonly used in getting the volume of many shapes including triangular pyramids and excluding irregular shapes (i guess) Getting the volume of a cube or a rectangular prism is very easy. just multiply the area of the base, or length times width, then multiply it to the height.

In getting the volume of a rectangular prism, the formula is still the same, the formula is a lifetime formula.

Getting the volume of a rectangular prism

In this example, same formula is used and just solve it, the unit of the answer or the volume is called cubic centimetres

Getting the Surface area of a rectangular prism

As said, the formula is 2(lw)+2(hl) + 2(hw). it is the very common in getting the surface area of a rectangular prism.
by the way, the variables stands for:
l-length
w-width
h-height

net of a rectangular prism