How to build the infrastructure to avoid/minimise earthquake damages?

Anchor All Precious Belongings. The expensive large-screen television set that has seen cherished family memories, the safe that contains your jewelry and standby money, the large 2-door stainless steel refrigerator that has housed many a family meal, the valuable décor pieces spread around your home, the prized china in your kitchen cabinet that has been unfailingly passed down several generations are all precious belongings that cannot be replaced easily or at all.

Close Those Doors. In the stress and hurry of our daily lives, how often do we nonchalantly leave our file cabinets or kitchen drawers or windows open?

Safeguard Your House from Hazardous Substances. As a regular family, you are bound to have several potentially hazardous chemicals and materials sprinkled all around your house.

Explanation:

an angle + its complement = 90 degrees

answer conditional instability;