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## Homework Statement

1. How can i determine the angle between two vectors

2. The Component of vector ( a vector, given below ) along the direction of i+j

3. Let there be a vector and b vector , then find component the component of a vector along perpendicular direction of b vector.

Please also do tell me what do you mean by along the direction and perpendicular to some vector and projection.

## Homework Equations

a vector=2i + 3j + 4k

b vector = 3i + 4j + 5k

## The Attempt at a Solution

Not Attempted yet cuz didn't understand it's meaning.