4
1 lines
A rectangle, by definition is an irregular quadrilateral. It has two pairs of parallel sides.
It has 2 symmetry lines
the same as a regular quadrilateral, 4
None normally unless it's in the form of a rectangle which has 2 lines of symmetry.
Depending on the triangle, there may be three, one, or none.
Four.
A closed wiggly line. or many irregular polygons such as scalene triangle, ordinary quadrilateral, trapezium (if not isosceles), etc.
A regular quadrilateral has 4 lines of symetry
There can be 4 different acute angles in an irregular 4 sided quadrilateral that all add up to 360 degrees.
There are always 2 diagonals in any quadrilateral whether or not it is irregular or regular
ALL quadrilaterals have 4 angles