In dividing the elements a good practice may be to choose corner angles in the range of ____

(a) 30-120°

(b) 90-180°

(c) 25-75°

(d) 45-180°

This question was addressed to me in an interview for internship.

My question comes from Two Dimensional Problem Modelling and Boundary Conditions topic in portion Two Dimensional Problems using Constant Strain Triangles of Finite Element Method