Semicircle

Partitioning a circle into two halves to form semicircles by drawing diameter.

Objectives

1. A diameter divides the circle into two equal halves and each such half is a semicircle or hemicircle.
2. Forming a semicircle by joining any two points on the circumference through its centre i.e. by drawing a diameter.

Estimated Time

10 minutes

Prerequisites/Instructions, prior preparations, if any

Circle and diameter should have been introduced.

Ask children the previous day to cut circles of given radius and bring.

Materials/ Resources needed

Non digital: White paper, compass and colour pencils

Process (How to do the activity)

1. Bring cut circles of different sizes.
2. Fold them into exact halves.
3. Recognise semicircles. Let them colour each half with different colour.
4. Identify the centre, circumference, diameter and semicircle of the circle.
5. Fold circle into exact half.
6. Draw diameter on folded line and colour each half with different colour.

• Evaluation

1. Were the students able to draw and cut perfect circles?
2. Was the folded line (diameter) passing through the center of circle?
3. In how many different ways can you draw semicircles for a given circle?