Soil Mechanics- Cohesionless Soil Nphi

hashman

Very silly question, but how do we find the angle using calculator. Its a step in a soil mech problem.

2. Relevant equations


The equation is :

N_phi= tan²(45+ θ/2)

given that N_phi= 4.183, the equation becomes

4.183= tan²(45+ θ/2)

How do we calculate this?


Edit: Sorry Mods can you please delete this thread. I figured it out :)