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In a circle with centre O, AB is the dia...

In a circle with centre O, AB is the diameter and CD is a chord such that ABCD is a trapezium. If `angle BAC=18^@`, then `angle CAD` is equal to:
केंद्र O वाले एक वृत्त में, AB व्यास है तथा एक ऐसी जीवा है कि ABCD एक समलम्ब बन जाता है | यदि `angle BAC=18^@` है, तो `angle CAD` का मान ज्ञात करें |

A

`72^@`

B

`36^@`

C

`54^@`

D

`18^@`

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