David W. answered • 07/15/15
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The standard form equation of a circle is a way to express the definition of a circle on the coordinate plane.
On the coordinate plane, the formula becomes (x−h)2+(y−k)2=r2
In that formula, the center is at the point (h,k) and the radius is r. That's why the standard form is pretty handy -- you can now easily draw the circle.
Looks like the equation from the problem becomes w2 + y2 = 16 and r=4
