[" 1i "O" be the origin,and "Pi2,3,4" and "Q(1,-2,1)" be any two points,"],[" that "OP perp OQ]

If O be the origin and P(2,3,4) and Q(1,-2,1) be any two points,show that OPOQ.

O is the origin, P(2,3,4) and Q(1,k,1) are points such that bar(OP)botbar(OQ). Find k.

If O is the origin P(2,3) and Q(4,5) are two, points, then OP*OQ cos anglePOQ =

If O is the origin P(2,3) and Q(4,5) are two, points, then OP*OQ cos anglePOQ =

If O is the origin and P = (1, -2, 1) and OP bot OQ , then Q =

O is the origin , P(2,3,4), Q(1,k,1) are points such that bar(OP) _|_ bar(OQ) then find k.

If O be the origin and if P(x_1, y_1) and P_2 (x_2, y_2) are two points, the OP_1 (OP_2) sin angle P_1OP_2 , is equal to