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ABCD is a cyclic quadrilateral such that...

ABCD is a cyclic quadrilateral such that AB is a diameter of the circle circumscribing it and `angle ADC=158^@`. Then `angle BAC` is equal to :
ABCD एक ऐसा चक्रीय चतुर्भुज है कि AB इसे घेरने वाले वृत्त का व्यास है और `angle ADC=158^@` है | कोण BAC का मान ज्ञात करें |

A

`50^@`

B

`38^@`

C

`68^@`

D

`40^@`

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