Chord length and distance for centre of the circle

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?