Question

In the figure below, is any side of ΔABC parallel to X axis? If so, the side is ______

Answer 1

Any line whose y-coordinate is a constant will be parallel to the X axis. Observe that B
and C have the same y coordinate, c, and hence this side BC is parallel to the X-axis.

Similarly, A and B have the same x – coordinates, -a, hence this side is parallel to the Y axis.