Angle type
Reflex Angle — Greater Than 180°, Less Than 360°
A reflex angle is the larger side of an angle — more than a straight line, less than a full circle. Classic example: 270° (three quarters of a circle).
Updated Online Protractor
Range: 180° < reflex < 360° (π < rad < 2π).
Examples: 210°, 270°, 300°, 330°.
Every angle has two readings that sum to 360° — the inner (≤180°) and the reflex. Use “Measure reflex angle” to flip which the tool shows as primary.
Live example — try it
Drag the second ray past 180° and enable “Measure reflex angle” to see the large arc become the primary chip.
Keyboard: Tab handles, arrows nudge 1px center / 1° ray (Shift 10px / 5°), R reset, G grid, L lock baseline, Z undo, Shift+Z redo, +/- zoom. Endpoint magnifier shows while dragging. Drag center, baseline ray, second ray. Snap preview before commit. Image stays local — never uploaded. Press Esc to exit fullscreen.
Camera stays local — capture is processed in your browser
Also useful: 360° protractor guide and how to use. For conversions, 270° ≈ 4.712 rad — see °→rad.