By definition, a triangle must have three angles. It is also known that the interior angles of a triangle must total 180 degrees. If a triangle contained a single interior angle of 180 degrees, the other angles of the supposed triangle would both have to be zero, and the supposed triangle would be a straight line.
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what is the difference between division and grade
There is 11 grades total not counting College
Grades are levels, and years are time. Some students skip grades based on their results, while others are held back to repeat grades.
is level 3. or grades 1-3
No, it is not. Grade can be a verb with distinct meanings (to score, to level) or a noun with the same general concept (a score, a level or level rise). It can be a noun adjunct in terms such as grade crossing.