Measure

On the Design tab, in the Action group: Select Measure to measure the distance and the slope between selected points. (Ctrl+U,M)

The Measure tool also produces area for any shape of 3 or more points. The first action sets the first point and subsequent actions add measureable results that appear in the Output window.

Line Tracing

When measuring a shape, you can also click and drag across the shape to trace it: