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this method works for any shape which is 3-D first find the formula of the shape lets say a cuboid (rectangular block) or known as rectangular prism its formula is
H x W x L (Height x Width x length)
lets say H=4
and W=30
finally L=15
15 x 30=450 so add 450+ 60+120=630
15 x 4=60 times it by two =1260 now minus the first number you got
4 x 30= 120 and there is your answer
1260-450=810
Answer=810
This was from the book bond Assesment book paper 4 question 25 thats how you work out Surface Area
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The total surface area! The total surface area! The total surface area! The total surface area!
