The curve is asymptotic to the line tangent to the fixed circle through the point O.

Then the slope of a line tangent to the curve at that point is the value of the marginal function at that point.

This is rather like being able to draw a straight line tangent at any point on a smooth curve.

If some how you could "turn off" the gravitational attraction of the earth, the aircraft would fly in a straight line tangent to its motion circling the earth.

Draw a line tangent to the curve at the point found in part 1.

Because continuous functions are locally linear, the best slope to substitute in would be the slope of the line tangent to at .

However, two curves (or two subcurves of one curve) may contact one another without crossing, as, for example, a line tangent to a circle does.

The basic computation thus attempts to find the shortest directed line tangent to four oblate spherical shells centered on four satellites.

Therefore a contour of a constant value of will also be a stream line, a line tangent to For the flow past a cylinder, we find:

Draw a line tangent to the circle which passes through the given non-central point.