Condition for Perpendicularity of two lines .

Line Perpendicular to a line

Condition of coplanarity of two lines and equation of the plane containing them

Foot of perpendicular on a line

Condition of parallel and perpendicular lines

Condition for the parallelism of the lines

Any point on the perpendicular bisector of a line segment joining two point is ________ from the two points.

Condition for concurrency of three lines

If a line is perpendicular is one of two given parallel lines; then it is also perpendicular to the other line.

Find the equation of the line which satisfy the given conditions: Perpendicular distance from the origin is 5 units and the angle made by the perpendicular with the positive xaxis is 30^(@) .