Q10 of 51 Page 26

Prove that : -

Formula: -




taking L.H.S



using Formula (i)



using Formula(ii)









L.H.S = R.H.S


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8

Show that four points whose position vectors are are coplanar.

 9

Find the value of for which the four points with position vectors and are coplanar.

 11

and are the position vectors of points A, B and C respectively, prove that : is a vector perpendicular to the plane of triangle ABC.

 12

Let and Then,

If and find which makes and coplanar.