A polygon is a closed figure with 3 or more sides/angles, and the lines must always be straight. A circle isn't a polygon. Quadrilaterals are always polygons but polygons are not always quadrilaterals.
So the answer is "sometimes."
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is an exterior angle of a quadrilateral always sometime or never 90 degrees
Always. In fact, one method of proving a quadrilateral a rhombus is by first proving it a parallelogram, and then proving two consecutive sides congruent, diagonals bisecting verticies, etc.
an equation ---------- has a soultion? a)always B)sometimes C)never
The negation of always is sometimes or never.
sometimes