First you need to make a net which is a rectangle that is flatten out where you'd be able to see all of the sides, like this.
The colours represents which are the same which is found across from each other.
(Eg. Red is the same as the Red across from it.)
Now measure each side to find how many centimetres that part has. You can just measure one part of each colour since they're all the same. Measure for Height, Length and Width. Once you get the measurements, multiply by 2 to represent the second part of that colour. (Since their are 2 colours that are the same for the same parts.)
Next add everything together to get the surface area!
Volume of Rectangular Prism
Finding the volume is really not such a big deal! Actually, all you have to do is take the measurements of the Length, Width, and Height and multiply them together! Easy right?
Same goes for when you're trying to solve a cube!
Make a net like you did on the rectangular prism!
Finding the surface area of a cube is really easy!! A piece of cake and I'll show you how!
A cube has all of the sides equal which means you just have to measure one side and that measurement goes for the Length, Width, and even Height!
Same goes for volume! It's just like how we did with the rectangular prism.
Hope you guys find this understandable! (especially the colour thingy part! XP)