so by he I'm guessing you mean your intellectual partner boyfriend .you don't really know right off the bat. you just trust him to the point where there is a lot of accurate proof that your...
If the triangle is equilangular, then all angles are 60 degrees: 180/3 = 60 If the measures of two angles are given, you can discover the 3rd one by subtracting the sum of the two angles from 180.
If he just wants a place to crash and leave his stuff, or some extra cash from you, or just sex, he definitely could be using you.
If he leaves without cuddling, he is probably using you like a free...