What is the scalar orthogonal projection (p, q) on the unit vector (s, t)?

What is the scalar orthogonal projection (p, q) on the unit vector (s, t)?
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Scalar projection=<a,b>·<s,t>/|<a,b>| (dot product). It's assumed that a and b are the components of the vectors. The vertical bars denote magnitude.

Angular parentheses denote vector (two-dimensional in this case).

Scalar projection=(as+bt)/√(a2+b2).

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