DE is the segment parallel to the side BC. The triangles have sides AB, BC, and CA. D, E, and F are the three sides' midpoints.
What is the triangle?
A triangle is a three-sided polygon. It is one of the most fundamental geometric forms.
The sides of the triangles are AB, BC, and CA.The mid points of the three sides are D, E, and F.
The new triangle sides are DE, EF, and FD. We can visualize the triangle as DEF given in the attachment.
Hence, DE is the segment parallel to side B.
To learn more about the triangle, refer to:
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