cbse easy ques......

Find the foot of the perpendicular from P(1, 2, 3) on the line
(sum line is given..........).......

Also obtain the equation of the plane containing the line and the point (1, 2, 3)........... My doubt is how do we find the equation of the plane???????????????????????????
Will it contain both d line and d point??????

5 Answers

62
Lokesh Verma ·

yeah it will contain both

You have 2 vectors (lines ) (vecotrs and lines are the same thing)

1) The one of the line
2) The one of the perpendicular

Hint : The cross product will give you somethint

1
Akand ·


the line and the point are diff rite.......... how will a common plane have both??????

62
Lokesh Verma ·

They will akand...

Look at the diagram you just made.. does it not look on the plane?

The plane of the monitor..

Moreover to prove this...

take a plane (infinite) passing through this line. and rotate this plane about the line.

Will it not cover all the points in the space?

Hence.. we know that it will cover that point as well..

The problem will only arise if the point is on the line

1
Akand ·

oh yeah............... thnx a lot nishant....... i forgot bout d plane of d paper.........hehe thnx again......

1
Akand ·

then i got d answer.......i was just thinkin geometrically heheh

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