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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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:
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.