World units
This page describes the units used in Stride.
Translation
In Stride, 1 unit of translation is 1 meter.

Rotation
In Stride, 1 unit of rotation is 1 radian. In case you're unfamiliar with radians: 2π radians = 360 degrees.

Note
Game Studo displays rotation in degrees.
You can easily convert degrees to radians and vice-versa using MathUtil.DegreesToRadians and MathUtil.RadiansToDegrees
var lookBehind = Quaternion.RotationY(MathUtil.DegreesToRadians(180f));