book Maths Puzzle Numerical Ability

CD=6 and AD=4 then DB=?

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book Other Question

I need to find the center of a circle with the points (1,-2),(1,4),(5,6). Using the standard formula (x-k)2+(y-h)2=r2. I plugged the points in for x and y, for example (1-h)2+(-2-k Describe the locus of the points.

Points that are equadistant from the vertices of the polygon.