To calculate the angle between two vectors, you will need to use this formula: cosθ = (u • v) / (|| u|| ||v||). I will need you to assume that there is an arrow on "u" and "v" at their different places, which indicates they have direction. || u || and || v || represent the length of both vector u and vector v, while u.v represent the dot product of the two vectors.
Suppose these two-dimensional vectors have (3,3) and (0,3) as the components for vector u and v, respectively. Vector u can be written as u= 3i +3j, and vector v= 0i + 3j. To calculate the length of vector u and v, we get use ||u||² = u²1 + u² 2 and ||v||² = v²1 + v²2. This gives √18 or 3√2 for vector u, and 3 for vector v.
To calculate the dot product of the two vectors, we use u • v = u 1 v1 + u 2 v2, to get 9. However, from the formula given above, cosθ = (u • v) / (|| u|| ||v||)= 9/(3√2×3)= 9/9√2= 1/√2. At this point, you can use your calculator to find the arccos or cos -¹ of 1/√2.