If vec(A) and vec(B)are perpendicular then vec(A) . vec(B)=. . . .

1.	If vec(A) and vec(B)are perpendicular then vec(A) . vec(B)=. . . .
Answer» `\|VEC(A)\|\|vec(B)\|` `\|vec(A)xxvec(B)\|` `\|vec(A) \|\|vec(B)\|cos180^(@)` `\|vec(A) \|\|vec(B)\|COS 90^(@)` ANSWER :D

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