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34.8 x 38.1 cm ⏐ 13.7 x 15.0 in (300dpi)
DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Pi is the sixteenth letter of the Greek alphabet. In the system of Greek numerals it has a value of 80. Most notably, pi is the ratio of a circle's circumference to its diameter in Euclidean geometry. The Greek alphabet has an important role in the nomenclature of astronomical bodies and subatomic particles.
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