February shadows
This task is about making and reading a graph.
One sunny day in February a group of students measured the length of the shadow made by a stick at different times during the day. Here are their results:
Time of day 
Length of shadow, in
centimetres (cm) 
10 a.m.  53 
11 a.m.  37 
1 p.m.  20 
1.30 p.m.  18 
2 p.m.  20 
3 p.m.  26 
4 p.m.  37 
a) 
Draw a line graph to show these results. 



b)  From the graph you have drawn answer the following questions.  
i) ii) 
How long would the shadow length be at 12 noon? ____________ cm What do you notice about the time of day and the length of the shadow? 
c) 
What causes the shadow length change during the day?




d) 
Some students made a simple sundial using a pencil and a sheet of paper as shown above. Their sundial made the shadow E at 9:00 a.m.
Which dotted line shows where the shadow will fall at 11:00 a.m.?


(A) (B) (C) (D) 
A B C D 