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
3.6 (to 1 dp)  4.2 (to 1 dp) 
4.5 (to 1 dp)  3.2 (to 1 dp) 
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