How do you work out surface area?

Answer 1

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