Plane

The DR's of the joining of the points

(1%2C2%2C3)

and

(3%2C4%2C5)

are

(3-1%2C4-2%2C5-3)

, i.e.,

(2%2C2%2C2)

Also, the mid point of the join of the points

(1%2C2%2C3)

and

(3%2C4%2C5)

(2%2C3%2C4)

%5Ctherefore

Equation of plane which passes through

(2%2C3%2C4)

and the D.R.'s of its normal are

(2%2C2)

2(x-2)%2B2(y-3)%2B2(z-4)%3D0

%5CRightarrow%20x%2By%2Bz-9%3D0

%5CRightarrow%20x%2By%2Bz%3D9%20.

Note : If any line is perpendicular to the plane then the DR's of a line is equal to the DR's of the normal to the plane.

Chapter Questions
1 MCQs