Cross-hatch lines used in Architectural drawings are normally drawn at a 45 degree angle.
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A hachure is a drawn repetitive pattern. For short, most people call it "Hatching". If the pattern is a set of parallel lines slanting down to the left, overlaid with the same pattern slanting down to the right (the two sets of lines 'cross' each other), then the name for that is a crosshatch.
Normally none but it does have perpendicular lines that meet at right angles.
Not normally but as an isosceles right angle triangle it will have perpendicular lines that meet at 90 degrees.
A reflex angle is an angle greater than 180 degrees and less than 360 degrees. To construct one draw two lines at an angle and draw the angle measurement circle around the side you normally don't do it on.
Lines that intersect at right angles.