1.

Can anyone help me with this prblm ......que. no. 14

Answer» HEY!!!

Assume a common centre O is the two concentric circles.

Draw OL perpendicular to AD

=> OL bisects AD and BC(theorem).

=> AL = LD---------(1)
and
=> BL = LC---------(2)


SUBTRACT (2) from (1).

=> AL - BL = LD - LC

=> AB = CD

HENCE PROVED

Hope this helps you


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