FWIW, Agnes, I never have any trouble understanding your meaning. It may be the wrong word once in a while but your meaning is always clear. Maybe sometimes you don't completely understand idiomatic English speech. It seems common for non-native speakers (in any language) to think they are not understood just because they are not as flawless as they are in their native language. That is not the case.

>Hi Cecil,
>
>do you talk about a polygon?
>
>let's say I have problems in translation.
>
>Use universal language.
>Make a sketch, and explain what angle you are searching
>
>Agnes
>
>>Okay, who knows Geometry?
>>
>>I have a dodecagon (12 sides) and because there are 12 vertices extending from the center of the dodecagon at equidistant points, that means that each angle is 30 degrees (30 * 12 sides = 360 degrees).
>>
>>If the outer area with the lines (vertices) come to are congruent lines (in length) and you have other parallel lines going around the 12 sides at equidistant points from the center to the outer edge, and those lines are all parallel, then how do you figure out those inner angles near the outer area? My challenge is in how to explain what I am looking for.
>>
>>Cecil