dot

Calculates the dot product (scalar product) of two 2D vectors.

The dot product is a scalar value that can be used to determine the angular relationship between two vectors. It is calculated as the sum of the products of their corresponding components: a.x * b.x + a.y * b.y.

Geometrically, the dot product is related to the cosine of the angle between the two vectors: A · B = |A| |B| cos(θ), where θ is the angle between vectors A and B, and |A| and |B| are their magnitudes.

Key properties and uses:

• If the dot product is 0, the vectors are orthogonal (perpendicular), assuming neither vector is zero.

• If the dot product is positive, the angle between the vectors is acute (< 90 degrees).

• If the dot product is negative, the angle between the vectors is obtuse (> 90 degrees).

• The dot product of a vector with itself (dot(v, v)) yields the square of its magnitude (|v|^2).

• It can be used to project one vector onto another.

Parameters