Complementary and supplementary angles
These are angle pairs defined by the total they add up to. The tool can derive them from your measured angle so you can copy/export them quickly.
Definitions
Complementary (sum to 90°)
Two angles are complementary if they add up to 90°.
Supplementary (sum to 180°)
Two angles are supplementary if they add up to 180°.
These relationships describe a sum. You may measure just one angle and compute the other if you know they form a right angle (90°) or a straight line (180°).
In the tool
- Place a measurement point and read the main angle value (degrees).
- Use the derived values (complementary/supplementary) shown alongside the point to verify constraints in diagrams.
- Export the data to reuse those values in a spreadsheet or report.
Exporting these values
In CSV/Excel/JSON exports, complementary and supplementary are included per point so you don’t need to recompute them later.