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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 = `142^@`, `angle BAC` is equal to:
ABCD एक चक्रीय चतुर्भज है जो इस प्रकार है कि AB इसे घेरने वाले वृत्त का व्यास है तथा कोण ADC = `142^@`, है | कोण `angle BAC` का मान ज्ञात करें |

A

`52^@`

B

`60^@`

C

`40^@`

D

`50^@`

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