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In Geometry
400
intersection of the lines drawn perpendicular to each side of the triangle through its midpoint
Perpendicular lines passing through a point are at right angles to each other.
Yes, but only in principle. In practice, you won't live long enough. Putting it in more positive terms: No matter how many lines have already been drawn perpendicular to a given line [segment], there's always enough room for a lot more of them.
In Geometry
Infinity
400
Lines are parallel if they are perpendicular to the same line. Since the lines m and l are parallel (given), and the line l is perpendicular to the line p (given), then the lines m and p are perpendicular (the conclusion).
They are perpendicular lines
One.
Parallel
intersection of the lines drawn perpendicular to each side of the triangle through its midpoint
Infinite lines because a circle has infinite lines of symmetry.
Magnetic north (which is a little different from north. as defined as the meeting point of all lines drawn perpendicular to the equator and passing through the northern hemisphere)
Perpendicular lines passing through a point are at right angles to each other.
Yes, but only in principle. In practice, you won't live long enough. Putting it in more positive terms: No matter how many lines have already been drawn perpendicular to a given line [segment], there's always enough room for a lot more of them.