part2
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- The area can be defined asthe amount of space covered by a flat surface of a particular shape.The area of a rectangle is the number of unit squares that can fit into a rectangle.
- okay , let's see what is surface area of cuboid
- daniel please explain me surface area of cuboid
- at daniel's house
- okay. For example let's imagine you have bought a brand new computer so what will be the surface area of the box in which the computer will be delivered
- let's take length=7cm, width=2 cm and height=4cm. So by formula 2lw+2lh+2hw you can find it
- so the answer will be 100 cm square.
- There is also lateral surface area of cuboid .The lateral surface area of a cuboid is the The sum of surface areas of all faces except the top and bottom face of solid but in total surface area we include top and bottom. So lateral surface area is same like curved surface area
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- so the formula is a2h(l + b) . In this the top and bottom are excluded
- can you please explain it in simple language. All your talk is going over the head
- Give me an question of lateral surface area I will try to solve it
- okay. let's take example of this room. Find the area walls of this room if the Length= 10m , width = 500 cm and height = 9m
- yes andrew you are right.
- hmm.....i guess the answer will be 9180 m square.
- no the answer is 270m square. I guess you forgot to change the value of cm in m
- ya, this is a very common mistake we all do. you just have to make your concepts clear and do practice regularly.
- but Andrew how did you give the right answer in the first time?
- ya of course
- because I am a genius. The chapter is easy
- ohh ya i made a silly mistake but i am clear with the formulas
- no problem
- thank you so much Daniel for helping
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