# Estimate Derivative

Estimate Derivative

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.

f(x)

x

T

f'(x)

T

(x,f'(x))

f'(x)

T