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It is a perpendicular line (a vertical line) that divides the triangle into two equal parts.
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If you are talking about the line that separates the north hemisphere and the south hemisphere, it is the equator.
A line segment that divides a circle in two is a chord.If the two parts of the circle are equal, the line segment is a diameter.See 'The Parts of the Circle' in Sources and related links, below.
A line that divides the letter so that the 2 halves are mirror images. Ex. The letter V ... A vertical line thru the bottom makes 2 parts that are mirror images, so that vertical line is the axis of symmetry. But.. A Capital E would not have a vertical axis of symmetry. Capital E would have a horizontal line splitting thru the middle line as its axis of symmetry.