Find the surface area of the following figure if it is folded along the dotted lines. (all the measurements are in cm)
215
Surface area of the figure = sum of areas of (I + II + III + IV + V)
=(15×3.5)+(5×3.5)+(15×3.5)+(5×3.5)+(15×5)
=215cm2
Alternate solution
Upon folding we get a cuboid excluding one of the top or bottom faces
Therefore surface area = 2(lb+ bh + lh) – lb = lb + 2h(l+b)
=(15×5)+7(20)=215cm2