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.
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Topics: Starter  Estimating  Pythagoras
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Previous Day  This starter is for 4 November  Next Day
4.1 (to 1 dp)  2.2 (to 1 dp) 
4.5 (to 1 dp)  5.0 (to 1 dp) 
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