With the measurement tools for vertical imagery, you can:

If you are using the New MapBrowser go to Measure in New MapBrowser.

Please refer to Height and Width Tools to learn how to measure height and width using oblique imagery.

Please refer to the 3D Line Tool and 3D Area Tool to learn how to perform 3D measurements using oblique imagery. 

If you are using MapBrowser Classic go to Measure in MapBrowser Classic.