Yes and a trapezium is also known as a trapezoid in the US
A triangle, no matter the type, can never have any parallel sides. To try this out, draw any two parallel lines on a sheet of paper and try to make a triangle out of it.
yes an arrowhead has 4sides because it is a quadrilateral but it doesn't have any parallel sides
A trapezium has just the 1 line of symmetry.
None.
2
It can - up to 6 pairs of parallel sides.
4
Yes.
You can prove it if you can prove that one pair of opposite sides is parallel (and, strictly speaking, that the other pair is not). Proving that the lines are parallel depends on the information available. Thier equations may have the same slope (gradient), or that the angles at their ends are supplementary, etc.
A triangle, no matter the type, can never have any parallel sides. To try this out, draw any two parallel lines on a sheet of paper and try to make a triangle out of it.
yes an arrowhead has 4sides because it is a quadrilateral but it doesn't have any parallel sides
4 because it's a quadrilateral shape
It has two pairs of parallel sides (4).
A trapezium has just the 1 line of symmetry.
No a kite has got no parallel sides
None.
2