The answer would be : a convention.
Hope this helps !
Photon
Answer:
A
Explanation:
Archimedes systematized the design of simple machines and the study of their functions and developed a rigorous theory of levers and the kinematics of the screw. His works contain a set of concrete principles upon which mechanics could be developed as a science using mathematics and reason.
The first calculation of π(pi) was done by Archimedes of Syracuse (287–212 BC), one of the greatest mathematicians of the ancient world.
Pandemic-the spread of disease across a wide area
Tariff-a tax on imported goods
Global warming-the gradual increase in earth’s average temperature
