\8
never
30
10
14
a and d
none of these answers are correct
never
never
none of these are correct
160 degrees.
No; it is false. The sum of all the angles of a quadrilateral always equals 360o.
280
square
24;
30
It is not possible to answer the question with the information provided. abcd is a polygon and, as such, cannot have a length. It is possible to say that ab = 2*af = 14 units and that, being the biggest dimension, is the length. However, the longest side is not always the length : sometimes the horizontal side is called the length with the vertical or angled side being the height.
15 units