Changes

[[File:arc.jpg|200px|right|link=]]

The part of the circumference within the two points in either directions are called its arcs.[[File:arc.jpg|200px|right|link=]]

=== Objectives ===

=== Objectives ===

#The students learn that an arc is a part of a circle included between two distinct  points on the circumference of the circle.

#The students learn that an arc is a part of a circle included between two distinct  points on the circumference of the circle.

#They should know that arc is part of the circumference.

#They should know that arc is part of the circumference.

===Materials/ Resources needed===

===Materials/ Resources needed===

White paper, pencil, compass, scale and colour pencils.

* Digital : Computer, geogebra application, projector.

* Non digital : Worksheet and pencil, compass, strings

* Geogebra files :  Arcs in a circle .ggb

===Process (How to do the activity)===

===Process (How to do the activity)===

*Explain the concept of arc by drawing a circle and two points on its circumference. The part of the circumference within the two points in either directions are called its arcs.

** If the circle is divided into 2 parts?

*Show the labelling of arcs.

*Evaluation

** Are the two arcs equal?

** Establish minor arc(smaller arc) and major arc(larger arc)

** Compare region enclosed by major arc and minor arc, which is larger?

** Animate the geogebra file to show  a major arc becomes a minor arc.

** If one is major arc, the other is a minor arc; can the two arcs be equal?What are they called?

** How are the two points with respect to center of the circle when arcs are equal.

** If the angle between the radii is fixed but radius of the circle is increased, what can you say about the two arcs?

*'''Evaluation'''

#What is the longest arc of a circle  called?

#What is the longest arc of a circle  called?

#What are the arcs called when both major and minor arcs are of same size?

#What are the arcs called when both major and minor arcs are of same size?