`DeltaABC` में, यदि `4/_A=3/_B=12/_C` हो, तो `/_A` ज्ञात करे ?

Options

A. `22.5^(@)`
B. `90^(@)`
C. `67.5^(@)`
D. `112.5^(@)`

Answer

c

Explanation

`4angleA=3angleB=12angleC`
`A:B:C=(1)/(4):(1)/(3):(1)/(12)`
`A:B:C=3:4:1`
No
`3x+4x+x =180`
8x=180
`x=(180)/(8)`
`angleA=3x=(180)/(8)xx3`
`=67.5`