The position vectors of three points P,Q,R
from a fixed point O are respectively
→
a ,
→
b
and
→
c . Show that the perpendicular
distance of the point P from the straight
line QR is
| |
| |
→ →
→ → → → → →
−
× + × + ×
b a
a b b c
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plz send a diagram cannot understand
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