Economics is about the production of goods and services, which requires the
allocation of what?

An economic system may involve production, allocation of economic inputs, distribution of economic outputs, firms, and the government to answer the economic problem of resource allocation.

H=   2(area/a+b)h= 2(144/a+b)h= 2(144/18+18)h= 2(144/36)h= 2(4)h=8