Page 64 - Mathematics Class - IX
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ACTIVITY 4.7
OBJECTIVE
To verify that in a circle, angles in the same segments are equal.
MATERIALS REQUIRED
Glazed paper Sketch pen
Adhesive Geometry box
A pair of scissors Tracing paper
PRE-REQUISITE KNOWLEDGE
1. Concept of a circle
2. Concept of angle subtended by a chord/arc
THEORY
For concepts, refer to Activity 4.6.
PROCEDURE
1. Draw a circle of any convenient radius (say 3 cm) and cut it.
2. Mark the centre O and a point P on the circumference of the circle as shown in Fig. (a).
3. Mark two more points Q and R on the circumference of the circle.
4. Fold and press the circle along QR to get a crease which is a chord of a circle.
5. Join PQ and PR to get ∠QPR as shown in Fig. (b)
P P
O O
Q R Q R
Fig. (a) Fig. (b)
6. Take another colour in glazed paper and cut the circle of same radius.
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