6. Look around your home and find three regular shapes. Calculate their area, using appropriate instruments and units.
7. Look at Fig. 25.32 and calculate the volume, in cm3
100 90 80 70 60 50 40 30 20 10
, of the stone.
100 90 80 70 60 50 40 30 20 10
(Fig. 25.32 8. Name two SI units used to measure mass.
9. A tradesperson is measuring a wall before painting it. Give an example of: a. a random error that could occur b. a systematic error that could occur
10. A petrol pump is incorrectly set and delivers the wrong volume of fuel each time. It displays one litre when only 0.95 litres have been delivered. Calculate:
a. how much the customer actually receives when 20 litres are registered
b. how much the customer loses out on in fuel each year, if they use this pump to put 20 litres a week into their car