Archimedes used it to calculate the area of a circle with a different formulation than Euclid's assertion that it is proportional to r².

“Secret of Secrets” is a mystery you’ll find as you explore Indiana Jones and the Great Circle’s Vatican. You’ll be able to find it once you reach the Sistine Chapel. The safe — and ...

Sector area Two radii separate the area of a circle into two sectors - the major sector and the minor sector. To calculate the sector area, first calculate what fraction of a full turn the angle is.