The description given could be applicable to a pyramid
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There is no such expression. The normal to a surface, at a given point is the radius of curvature of the surface, at that point.
A curved surface area can be described as one where the gradient of the normal to the surface changes smoothly from point to point.
NONE!!!!! 'One point' has no dimensions, so there are no square feet in one point.
If ... the square of (the x-coordinate of the point minus the x-coordinate of the center of the circle) added to the square of (the y-coordinate of the point minus the y-coordinate of the center of the circle) is equal to the square of the circle's radius, then the point is on the circle.
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