You want to put a 1-cm black border round a family photo that measures 8 cm by 10 cm
How much black paper would you need to create the border?
A rectangular piece of cloth measures 80 cm by 60 cm
When it is placed on a rectangular table, it leaves a margin 5 cm wide all round it.
Find the area of the table not covered by the cloth
Area of table not covered by cloth
Area of table
Area of cloth