Which Way Does the Cloud Point?

A sensor records two readings, $x$ and $y$, on every sample. Four samples came back:

Run PCA on this data: centre it, build the $2 \times 2$ covariance matrix, and find the first principal component.

What angle does the PC1 direction make with the positive $x$-axis?

Report the acute angle in degrees — a number strictly between $0$ and $90$ — rounded to two decimal places.