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Procedure : (i) Draw a circle with cen...

Procedure :
(i) Draw a circle with centre O and with suitable radius.
(ii) Make it a semi - circle through folding . Consider the poin A,B on it
(iii) Make crease along AB in the semi circles and open it.
(iv) We get one more crease line on the another part of semi circle, name it as CD (observe AB= CD)
(v) Join the radius to get the `DeltaOAB` and `DeltaOCD`.
(vi) Using trace paper, take the replicas of triangle `DeltaOAB` and `DeltaOCD`
(vii) Place these triangles `DeltaOAB` and `DeltaOCD` one on the other.
Observation :
(i) What do you observe ? Is `DeltaOAB-=DeltaOCD` ?
(ii) Construct perpendicular line to the chords AB and CD passing through the centre O. Measure the distance from O to the chords

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