Thank you so much for including this skill. I keep forgetting the English terms for geometric terms and this is really helping. I just learned a new English word...

Yes, I think you've got that right. The closed four-sided polygon with two parallel sides is definitely called a trapezoid in the U.S., and probably in Canada, too. A vertex is a point where edges meet, or colloquially, a corner.

It's a very long time since I did Geometry, but I'm sure that in my day we called "vertices" "corners" in Australia! And I'm sure that we called "trapezoids" "trapeziums".