The roof of a house is flat and measures $16$16 m by $15$15 m in the shape of a rectangle.
What is the area of the roof?
If a water tank collects all the water from the roof, how many litres of water would it collect if there had been $20$20mm of rain?
After a while, the water tank reaches full capacity.
If a further $10$10 mm of rain falls before the sky clears, how many litres of rainfall are not collected as a result?
The outline of a block of land is pictured below.
A floor plan for a house is shown below, with measurements given in mm. The annual rainfall over the house is $360$360 mm.
The image below shows the outline of a construction site for the foundations of a large office building.