pi
1 of 1noun/paɪ/
Forms:pis
1
an antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs
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2
the 16th letter of the Greek alphabet
3
the scientist in charge of an experiment or research project
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4
a mathematical constant representing the ratio of a circle's circumference to its diameter, approximately equal to 3.14159
- Trigonometric functions involving angles in radians often yield results containing multiples of pi.
- Sine and cosine waves are periodic functions with periods that are multiples of 2π, a property tied to the circle and pi.
- The Riemann zeta function involves pi in its value at even integers, such as ζ(2)= π²/6.
- In geometry, the area of a sector of a circle is determined by the formula A = 0.5 r² θ, where θ is the angle in radians, often involving pi.
- The circumference of a semicircle is C = π * r, showcasing the presence of pi in geometric calculations.