Either estimate the lengths of the red lines or, if you know how, calculate how long they are.
The dots are one unit apart both vertically and horizontally.
Topics: Starter  Estimating  Pythagoras  Vectors
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Previous Day  This starter is for 4 November  Next Day
4.5 (to 1 dp)  4.1 (to 1 dp) 
4.2 (to 1 dp)  2.2 (to 1 dp) 
Note to teacher: Doing this activity once with a class helps students develop strategies. It is only when they do this activity a second time that they will have the opportunity to practise those strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter from random numbers.
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Teacher, do your students have access to computers such as tablets, iPads or Laptops? This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments: Transum.org/go/?Start=November4 However it would be better to assign one of the student interactive activities below. 

Here is the URL which will take them to a related student activity.