Very Long Line
If the line on the right were 0.2mm thick, how long would it need to be to cover an area of one square metre?
Age
14 to 16
Challenge level
Problem
Image
If you liked this problem, here is an NRICH task that challenges you to use similar mathematical ideas.
Student Solutions
Answer: 5 km
0.2 mm
= 0.02 cm
= 0.0002 m
length $\times$ width = area
10 000 $\times$ 0.0002 = 2
5 000 $\times$ 0.0002 = 1