Quarter Circle

Author

Eric W. Weisstein
August 29, 2026

This notebook downloaded from https://mathworld.wolfram.com/notebooks/PlaneGeometry/QuarterCircle.nb.

For more information, see Eric's MathWorld entry https://mathworld.wolfram.com/QuarterCircle.html.

Copyright 2026 Wolfram Research, Inc. except for portions noted otherwise

Figure

The highlighted arc is a quarter circle. The radii are shown only to indicate its central angle.

Diagram

Graphics[{{StandardGray,AbsoluteThickness[2],Line[{{0,1},{0,0},{1,0}}]},{,AbsoluteThickness[5],Circle[{0,0},1,{0,(π/2)}]}},ImageSize->250]