book Maths Puzzle Numerical Ability

Describe the locus of the points.

Points that are equadistant from the vertices of the polygon.

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book Other Question

find 3 consecutive integers such that the sum of the first two integers is nine more than the third integer. Is this correct?
4|x|+|-4|=|-6|
4|x|+|-4|-|-4|=|-6|-|-4|
4|x|=|-6-4|
4|x|=|-10|
|x|=|-2.5|
x=-2.5