If `barAB = barb` and `barAC = barc`, then the length of the perpendicular from A to the line BCis

If bar a, barb, barc are three mutually perpendicular vectors of equal magnitude, then the angle made by bar a+barb+barc with each of bar a, barb, barc is

If V is the volume of the parallelopiped having three coterminous edge, as, bara ,barb and barc then the volume of the parallopiped having three coterminous edges as baralpha=(bara.bara)bara+(bara.barb)barb+(bara.barc)barc barbeta=(barb.bara)bara+(barb.barb)barb+(barb.barc)barc bargamma=(barc.bara)bara+(barc.barb)barb+(barc.barc)barc is

[bara barb barc]+[bara barc barb] =

If bara,barb,barc are unit vectors such that bara is perpendicular to the plane of barb,barc and the angle between barb and barc " is " pi/3 " then find " abs(bara+barb+barc) .

bara,barb,barc are non coplanar and bard=x(bara xx barb) +y(barb xx barc) +z(barc xx bara) . If bard is perpendicular to the vector bara+barb+barc then

If bara.barb=barb.barc=barc.bara=0 then the value of [bara" "barb" "barc] is equal to

ABCD is a rectangle.BarAC and bar BD.Write the pairs of parallel lines,perpendicular lines and intersecting lines from the figure in symbolic form. Perpendicular lines