Construct and reason.

Points, lines, circles, and their dependents.

Angle unit: Affects measured-angle labels and the rotate tool's input here, and the Complex panel's arg() readout. Shared across this browser (this doesn't change how typed expressions like sin(x) are evaluated -- those stay radians).

Objects: point line circle reflect polygon angle anchor

Actions: rotate translate scale

Select: select

Click empty space to place a point, or drag an existing one.