Argand plane · manipulative

Addition as vector addition

Drag z₁ and z₂. Toggle the sum — a copy of z₂ slides tip-to-tail onto z₁, and the diagonal is the resultant.

z₁ z₂ z₁+z₂

Drag points · scroll zoom · drag background to pan

The numbers

Show the sum
animate tip-to-tail, then reveal z₁ + z₂

Working