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((3pi)/(5)) रेडियन किसके बराबर होगा...

`((3pi)/(5))` रेडियन किसके बराबर होगा

A

`100^(@)`

B

`120^(@)`

C

`108^(@)`

D

`180^(@)`

लिखित उत्तर

Verified by Experts

The correct Answer is:
c
`angle A+angleB=135^(@)` .........(i)
`angleA-angleB=(pi)/(12)=15^(@)` .......(ii)
adding both equation
` 2angleA=150^(@)rARrangleA=75^(@)`
`angleB=60^(@)`
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