What is the angle of a trapezium and how many symmetry lines does it have

A trapezium is a quadrilateral with one pair of parallel sides. It does not have a specific angle, as its angles can vary depending on the lengths of its sides. However, the opposite angles of a trapezium are supplementary, meaning that they add up to 180 degrees.

As for the symmetry lines of a trapezium, it can have at most one line of symmetry if it is an isosceles trapezium (the non-parallel sides are equal in length). Otherwise, a trapezium generally does not have any symmetry lines.