एक triangleABC में, BC को D तक बढ़ाया ग...

एक `triangleABC` में, BC को D तक बढ़ाया गया है, `angleACD = 120^(@), angleB 1/2= angleA` तो ∠ABC क्या है?

A

`60^(@)`

B

`75^(@)`

C

`80^(@)`

D

`90^(@)`

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