Answer:
We conclude that a diagonal of a quadrilateral is a line segment that joins two opposite vertices of the quadrilateral.
Explanation:
- Please check the attached diagram.
From the attached diagram, it is clear that the line segment AC of the parallelogram quadrilateral joins two opposite vertices A and C.
It is also clear that the other line segment BD of the parallelogram quadrilateral joins two opposite vertices B and D.
Therefore, we conclude that a diagonal of a quadrilateral is a line segment that joins two opposite vertices of the quadrilateral.