measurement of the angle between planes

how can there be such an angle?

First, it looks like you have two surfaces selected which makes for a compound angle relative to each other. The 128° angle is that compound angle highlighted in orange.

it seems not complicated, the part is quite simple.
maybe like that1.shapr (144 KB)

Hi, would you still like to know how to measure the angle between any faces in the attached workspace?

I will be blogged for help

@Victor_Shapr3D Not sure what Dim means above by “blogged for help” but I sure would.

Hi Nate! Selecting both inclined faces just as Mike explained above should display the angle at the bottom of the workspace.

Please let me know if this is not the case for your design and attach an image to help me better understand and see the positioning of the faces.