1.

Let vec(a) , vec(b),vec(c) be vectors of length 3,4,5 respectively. Let vec(a) be perpendicular to vec(b)+ vec(c), vec(b)tovec(c) + vec(a)and vec(c)to vec(a) + vec(b) . Then |vec(a) + vec(b) + vec(c)|.

Answer»

`2sqrt(5)`
`2sqrt(2)`
`10sqrt(5)`
`5sqrt(2)`

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