The lines that intersect to Form A right triangle are called Perpendicular Lines; the resulting meeting point of these two lines is called the vertex of the angle.
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The point of intersection.
Vertically opposite.
Rhombus
Two planes that intersect are simply called a plane to plane intersection. When they intersect, the intersection point is simply called a line.
A parallelogram with right angles is a rectangle.---------------------------------To construct a right angle using a straight edge and a pair of compasses:Draw the first lineExtend the first line beyond the point where the right angle is required (call this point O).With the point of the compasses on the point where the right angle is to be constructed draw a small arc on the straight line either side of point O; call the points where these arcs cross the straight line as A and B.Open the compasses to a larger widthWith the point of the compasses on one of points A and b (say A) draw one arc above the line roughly in the middle between points A and B (above point O).With the point of the compasses on the point of A and B (say B) draw an arc to intersect the last arc just drawn (above point O); call this point CUsing the straight edge, join point O to point C, forming a right angle.rub out the extended bit of the line beyond point O that was used to construct the right angle.