A) A perpendicular line to one side of a triangle.
Explanation:
The converse of the triangle proportionality theorem states "<span>If a line divides two sides of a triangle proportionally, then that line is parallel to the third side."
The AA similarity theorem is part of this, as we are looking at the ratios of the sides. Proportionality of the sides is part of this, as it is stated in the converse. A parallel line to one side of a triangle is part of this, again as it is stated in the converse.</span>
To answer the question, please
refer to the attached image below:
I am hoping that this answer has
satisfied your query and it will be able to help you in your endeavor, and if
you would like, feel free to ask another question.