When is Pi (π) day celebrated all over the world?
Correct answer: C. 14 March
- A. 4 March
- B. 10 March
- C. 14 March
- D. 20 March
Explanation
Pi Day is observed on 14 March because the date is written 3/14 in the month-day format, matching the first three digits of π, 3.14.
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Inventions and Discoveries covers the people, dates, principles and practical uses behind developments such as the wheel, printing press, telephone, electricity, radio, computer, internet, vaccines and space technology. It distinguishes an invention, which creates a device or process, from a discovery, which identifies something already present in nature.
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