How might people adapt to life in an area with steep mountains?

Explanation:

Life around an area with steep mountains can be very arduous. The steep peaks will pose serious impediment to transportation and other likely issues.

To adapt to an area of this topography, a local population can take some of these measures;

Terrace farming would be the best approach for cultivating food crops. These slopes can broken into series of terraces like steps which will cut surface erosion, and invariably, the loss of rich top soils. Also, the slope can be cut and traced to develop means of transportation from places to places. There are special breeds of animals that thrives in areas of steep slopes, they can be adopted by the locals, and bred for animal products. Mining activities can also be encouraged in such a locality.

The figure is not necessarily a parallelogram because only one diagonal is bisected and only one pair of sides is congruent.

The answer to the first one is barometer.