Look at the cuboid below.
What is its surface area?
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Look at the cuboid below.
What is its surface area?
We identified that the faces are
3*3, 3*11, 11*3
As the opposite faces of an cuboid are equal, we know that for each face we find there is another face, therefore:
3*3, 3*11, 11*3
or
(3*3, 3*11, 11*3 ) *2
To find the surface area, we will have to add up all these areas, therefore:
(3*3+3*11+11*3 )*2
And this is actually the formula for the surface area!
We calculate:
(9+33+33)*2
(75)*2
150
150
A cuboid is shown below:
What is the surface area of the cuboid?
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