Trigonometry studies triangle angles and sides relationships. Sine function relates opposite side to hypotenuse in right triangles. Sine function oscillates between -1 and 1 as angle increases
Circumference is the perimeter of a circle, measuring the boundary of the circle. Circle is a closed figure with all points equidistant from a fixed center. Three main elements: center, diameter, and radius
Pi is defined as the ratio of a circle's circumference to its diameter. Archimedes defined Pi between 3.1408 and 3.4129 in 250 BC. Modern calculations of Pi exceed 50 trillion digits
Circle area is the space occupied by a circle in two dimensions. Area is measured in square units like m², cm², etc. Basic formula: A = πr²
Circle area is calculated using the formula πr². Area is all space inside a circle's circumference. Area is not part of the circle itself
Pi Day is celebrated on March 14th, denoted as 3.14 in the US. Pi represents the ratio of a circle's circumference to its diameter. Pi is irrational and continues infinitely without a repetitive pattern