A gateway is to be made of cardboard for a play set with dimensions as shown in the picture.
How much cardboard is needed for this?
We can make it by joining three separate rectangles as shown below:
Now, area of the gateway = area of the new rectangle formed
Area = (4 + 5 + 6) × 10
= 15 ×10 = 150 m2 (Lateral surface area of the prism)
Hence, 150 m2 cardboard is required to make the gateway.