Similar triangles may or may not have equal side lengths
The true statement is (a) the slope of DF is equal to the slope of CD
<h3>How to determine the slopes of DF and CD</h3>
The similar triangles are given as:
Triangle DEF and triangle CBD
The above means that the corresponding lines DF and CD have equal slope
The slope of segment DF is calculated as:

While the slope of segment CD is:

Hence, the true statement is (a)
Read more about similar triangles at:
brainly.com/question/14285697