You can measure with:
You can set the width and height of an object in the selector control bar.
The angle is measured by default from 3 o'clock origin counterclockwise (the mathematical convention), but in Preferences you can switch this to using compass-like measurement (from 12 o'clock, clockwise).
The measure tool. Just click on a start point, hold the mouse button, and drag to the desired end point. Just as you would use a measurement tape. Snap is working