Argand plane · manipulative

Lines and circles as loci

Pick a locus and drag its defining points. Optionally turn on a test point z to check whether it satisfies the equation — and shade regions for strict inequalities.

centres boundary

Drag centres · scroll zoom · drag background to pan

Locus preset

Strict inequality
shade the region (< or >) instead of the boundary only
Show test point z
drag z to check whether it lies on the locus (or in the shaded region)

Parameters

Working