Respuesta :

unicornetfairies

BC is 3 across & CA is 3 up, but this creates a right-angle triangle. So, Pythagoras Theorem is used to find AB

AB = root 3^2 + 3^2

AB = 3 root 2

or 4.242640687

Thus, AB is 4.24 to 2d.p

(root means square root)

Hope this helps!

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