Measuring distances and angles in a 3D view in Revit is an essential skill for architects and BIM professionals. Here's how you can do it:

1. Open the 3D view in Revit that you want to measure in.

2. Select the 'Analyze' tab from the ribbon at the top of the screen.

3. Click on the 'Measure' tool from the dropdown menu.

4. Choose the type of measurement you want to make - distance, angle, or radius.

5. Click on the two points or lines to measure the distance or angle between them.

6. The measurement will be displayed on the screen, and you can also see it in the properties palette.

7. If you want to measure multiple distances or angles, simply repeat the process.

Using the measurement tool in Revit's 3D view allows you to accurately quantify and understand the spatial relationships within your model. This is crucial for ensuring that your design meets the necessary requirements and dimensions. Practice using the measurement tool in different 3D views to master this skill and improve the accuracy of your architectural designs.