pi
Roughly three-point-fourteen
Pi (π) is the mathematical constant representing the ratio of a circle's circumference to its diameter—approximately 3.14159, extending infinitely without repeating.
Pi Day is celebrated on March 14 (3/14).
Calculate the area using pi times the radius squared. (Capitalized Pi is the Greek letter; PI is private investigator.)
Lacking sound judgment
- transcendentalBeyond ordinary experience
- ratioComparative numerical relation
- ArchimedesGreek polymath, physicist
- EulerProlific 18th-century mathematician
Ramanujan · approximation · infinite · decimal · digits · memorization · quadrature · squaring
Circle's outer measurement
- diameterDistance across through center
- radiusCenter-to-perimeter distance
- areaExtent of surface
- arcCurved line segment
sector · chord · tangent · radian · inscribed · perimeter · disk · round
irrational
Lacking sound judgment
- transcendentalBeyond ordinary experience
- ratioComparative numerical relation
- ArchimedesGreek polymath, physicist
Euler · Ramanujan · approximation · infinite · decimal · digits · memorization · quadrature · squaring · computation
circumference
Circle's outer measurement
arc · sector · chord · tangent · radian · inscribed · perimeter · disk · round · curvature
geometry
Science of spatial relationships
- trigonometryTriangle angle mathematics
- calculusMathematical analysis system
- sineOpposite over hypotenuse
cosine · integral · e · imaginary · formula · Taylor · Leibniz · proof · theorem · analysis
alpha
First Greek letter
epsilon · theta · lambda · sigma · phi · omega · symbol · sixteenth · notation · variable
pie
Fifth alphabetic character
straight line · rectilinear · phi · square · right angle
- apple piePastry with cooked fruit
- pumpkin pieSpiced squash custard pastry
- easy as pieExtremely simple to accomplish
- pieces of the pieAllocated portions of whole
- cherry piePastry with red fruit
- pie crustBaked outer layer