Circle as a shape
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A circle is the set of all points in the plane that are a fixed distance from a fixed point.
Objectives
Understanding circle as a shape
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
- Geogebra files : Introduction to circles.ggb
Download this geogebra file from this link.
Process (How to do the activity)
- Draw circle with ‘circle with center and point’ or use the slider
- What do you notice, how is the circle formed.
- Which point is the centre of the circle ?
- Plotting points on the circle, connect these points to the centre of the circle.
- What can you say about the segment lengths?
- Measure the segment lengths to show they are equal.
- Establish center of the circle’ and ‘radius’
- Differentiate between circle and region enclosed by a circle.
- Evaluation:
- By what parameter is the size of a circle defined ?
- Bigger the radius, _____________
- How do you name a circle ?
- Can you draw a circle without knowing the radius ?