Make sure there is a small D at the top of the calculator screen, and if not, go into the calculator settings to change the angle unit to 'degrees' (or 'deg'). The aim is to find the value of Ɵ ...

Since you know that all angles in a triangle add up to 180°, you have to add up the values of the angles that you do know and then subtract them from 180°: Angles d and e must now both equal 130°.

In addition to the well-known magic angle of 1.1°, other magic angles in twisted bilayer graphene have been predicted and observed at slightly higher values. For example, a second magic angle has been ...