Angle types: acute, right, obtuse, straight, reflex
Angle “type” is a quick label based on the size of the angle. In the tool, the mode you choose (180° vs 360°) affects whether you can measure reflex angles correctly.
Common angle types
Acute (0°–90°)
Smaller than a right angle. Many photo/diagram angles fall here once aligned.
Right (90°)
A perfect corner. Use Snap if you want to land on exactly 90°.
Obtuse (90°–180°)
Wider than a right angle but less than a straight line.
Straight (180°)
A flat line. Useful for checking alignment and baselines.
Reflex (180°–360°)
The “outside” angle that goes past 180°. Use 360° mode to read it correctly.
How this maps to the tool
- Use the grid/rotate/flip to align a clear edge first; misalignment is the #1 reason a type looks wrong.
- If you need an angle larger than 180°, switch to 360° mode before reading the value.
- Keep the protractor center on the vertex and align the baseline with one side, then rotate to match the other side.
- If the reading keeps jumping, adjust Snap (common angles vs step) or temporarily turn Snap off for a free move.