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Activity: From Secant Lines to Tangent Lines
Go to: http://www.teacherlink.org/.../home.htm (opens a new window)
Description: This activity demonstrates one of the many ways Sketchpad can be used in a calculus or math analysis class. Here, students explore the relationship between the slopes of secant lines to a curve and the slope of a tangent line to the curve using Sketchpad's dynamic features. They investigate the limit concept and express the relationship between the slopes of secant lines and slope of tangent lines as a limit statement.
Technology Type: Sketchpad 
Author: teacherlink.org--Center for Technology and Teacher Education
Language: English 
Cost: Does not require payment for use

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Courses: PreCalculus limits, derivative, tangent line
Calculus Derivatives analytically, And average rate of change, As the lim. of the diff. quot., Slope of a curve at a point, Tangent line