Condition for a line to lie in a plane

Condition of line to be parallel perpendicular and intersecting

Read the graph carefully: Write the algebraic condition, when two lines are intersecting lines.

Condition of intersection of line and ellipse

Find the condition that the lines vec r=vec a+t(vec b xxvec c),vec r=vec b+p(vec c xxvec a) may intersect.Accepting that condition,find the point of intersection.

Condition for concurrency of three lines

If the lines joinilng the origin to the points of intersection of the lines y=mx+cd will the circle x^(2)+y^(2)=a^(2) be perpendicular then the required condition is……………

From Figure,name All pairs of parallel lines. all pairs of intersecting lines.lines of whose point of intersection in P lines whose point of intersection in C lines whose point of intersection in R collinear points.

Form Fig.,write all pairs of parallel lines.all pairs of intersection lines.lines whose point of intersection is l. lines whose point of intersection is D .lines whose point of intersection is E .lines whose point of intersection is A. collinear points