Every triangle has three sides...
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The minimum number is zero(0). The maximum number is one (1).
An isosceles triangle - a triangle with two sides of equal length.
The sum of the internal angles of a triangle (in 2-d) must be 180 degrees. If there are two right angles - of 90 degrees each - then the third angle would be 0 degrees! That would not be a triangle.
It can have any value x degrees where 0 < x < 45.
I am not sure, but if 1 angle is 180°, and the rest are 0°, than maybe. Try drawing that! It is a line, which has 4 sides, because the ends still measure something. That could be one :)