What does А = лr 2 mean

Area of a circle. A is the area, the symbol between the “=” and the “r” is pi, which can be estimated to 3.1415, and “r” is the radius of the circle

in geometry, parallel lines are lines in a plane which do not meet; that is, two lines in a plane that do not intersect or touch each other at any point are said to be parallel. by extension, a line and a plane, or two planes, in three-dimensional euclidean space that do not share a point are said to be parallel.