I constructed a trapezoid with equal legs that does not have equal base angles. Am not nitpicking 0.1 degree. But in other tests, the angles are equal to 3 decimal places in the display. The only difference here is that the trapezoid was first drawn on a construction plane.
Oops, I misspoke a bit; the angles are not all exactly equal in my test case but no big deal. Including the original with all 4 angles shown FYI.