Chord length and distance for centre of the circle

For a chord the distance from the center is the  perpendicular distance of the chord such that it passes through the center.

Objectives
Understand the relation between chord length and distance from the center

Estimated Time
30 minutes

Prerequisites/Instructions, prior preparations, if any
Prior knowledge of point, lines, angles, polygons

Materials/ Resources needed

 * Digital : Computer, geogebra	application, projector.
 * Non	digital : Worksheet	and pencil, compass, strings
 * Geogebra	files : Chord	length and perpendicular distance.ggb

Process (How to do the activity)

 * For	a chord in a circle construct a perpendicular through the center of	the circle.
 * Move chord closer to center of	the circle, note the perpendicular distance in the worksheet.
 * What	can you notice between chord length and perpendicular distance? When	is the perpendicular distance equal to zero?