If hati + hatj, hatj + hatk , hati + ha...

`If hati + hatj, hatj + hatk , hati + hatk ` are the position vectors of the vertices of a `Delta ABC` taken in order, then `angle A` is equal to
a)`pi//2` b)`pi//5` c)`pi//6` d)`pi//4`

`pi//2`

`pi//5`

`pi//6`

`pi//4`

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`If hati + hatj, hatj + hatk , hati + hatk ` are the position vectors of the vertices of a `Delta ABC` taken in order, then `angle A` is equal to a)`pi//2` b)`pi//5` c)`pi//6` d)`pi//4`

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`If hati + hatj, hatj + hatk , hati + hatk ` are the position vectors of the vertices of a `Delta ABC` taken in order, then `angle A` is equal to
a)`pi//2` b)`pi//5` c)`pi//6` d)`pi//4`