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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= 40^@`., then `angle CAD` is equal to:
केंद्र O वाले एक वृत्त में, AB व्यास है और CD एक ऐसी जीवा है कि ABCD समलम्ब है | यदि `angle BAC= 40^@` है, तो `angle CAD` ज्ञात करें|

A

`30^@`

B

`60^@`

C

`75^@`

D

`45^@`

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