Should the Bass Trap 1. Angular [filling the corner] or 2. Flat board type having triangular space behind them ?
I hope the question is correct.

Pictured: Casio CZ5000, M-Audio Axiom49 (iPad controller), Korg Electribe A, DSI Mopho, Nord Lead 2x, iConnectMidi4+, Focusrite Scarlett 18i20, Waldorf Q, Focusrite Penta, Behringer Patch bays, Native Instruments Kore Controller, iPad, Nektar Impact LX, Electrix Filter Factory, Electrix Mo-Fx, Akai MPD18, M-Audio SP5B's, Custom room treatment, 18 month old mixing engineer
 
Not pictured: DSI Mopho Desktop, Boss DR-770, Casio PT30, Midiman Oxygen8, Arturia MiniLAB, Garrison Acoustic Guitar, Gibson SG Standard, Line6 Spider II, Pod XT Live and a few other guitars, pedals, and DYI synths/effects

Snehankur
Should the Bass Trap 1. Angular [filling the corner] or 2. Flat board type having triangular space behind them ?
I hope the question is correct.

I'd go with a flat panel at least 6" (15cm) thick, 24" (60cm) wide, straddling the corner.  Air behind a panel is almost as good as absorption.  Some people fill the corner which is easy to do, and effective because it's automatically thick (as long as it's wide enough), but if it's an outside corner in a building which experiences cold winters, you may get condensation on your walls (behind all that insulation), which you don't want.
 
The advantage of flat panels is you can move them around and use them in all sorts of other ways.  They also don't damage your walls as much as building in the corners.
 

reactorstudios

Pictured: Casio CZ5000, M-Audio Axiom49 (iPad controller), Korg Electribe A, DSI Mopho, Nord Lead 2x, iConnectMidi4+, Focusrite Scarlett 18i20, Waldorf Q, Focusrite Penta, Behringer Patch bays, Native Instruments Kore Controller, iPad, Nektar Impact LX, Electrix Filter Factory, Electrix Mo-Fx, Akai MPD18, M-Audio SP5B's, Custom room treatment, 18 month old mixing engineer
 
Not pictured: DSI Mopho Desktop, Boss DR-770, Casio PT30, Midiman Oxygen8, Arturia MiniLAB, Garrison Acoustic Guitar, Gibson SG Standard, Line6 Spider II, Pod XT Live and a few other guitars, pedals, and DYI synths/effects

Great to see.... World record ?

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http://forum.cakewalk.com/Show-and-tell-your-SONAR-Studio-layoutgive-us-descriptions-pix-ideas-m3329829.aspx
 

Some nice setups here. Here is mine http://forum.cakewalk.com/FindPost/3329904
All the best.