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## 'Square Coordinates' printed from http://nrich.maths.org/

Play with this interactivity until you can draw tilted squares confidently.

Formulate and describe a general instruction for the construction of a square when you are given two adjacent corners.

Formulate and describe a general instruction for the construction of a square when you are given two opposite corners.

Decide whether any of the collections of points below form a square.

If so, which ones?

Can you do this without plotting the points on a grid?

1. $(8,3)$, $(7,8)$, $(2,7)$, $(3,2)$

2. $(3,3)$, $(7,4)$, $(8,8)$, $(4,7)$

3. $(16,19)$, $(18,22)$, $(21,20)$, $(19,17)$

4. $(4,20)$, $(21,19)$, $(20,2)$, $(3,3)$

Explain how you decided.