Estimate Derivative

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The tangent to the graph of at
is extended one unit to the right to form a right-angled triangle
whose hypotenuse has the slope
. Therefore the tangent function of the angle of
at
is
and can be read off the scale to the right of
. Read the first two digits from the brown scale and the third digit from the pink Vernier scale, where a pink mark is aligned with a brown mark.
Contributed by: Izidor Hafner (February 2013)
Open content licensed under CC BY-NC-SA
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"Estimate Derivative"
http://demonstrations.wolfram.com/EstimateDerivative/
Wolfram Demonstrations Project
Published: February 28 2013