Interactive angle measurement trainer — LC = 1°
A protractor is an instrument used to measure and lay out angles in engineering drawing, sheet metal work, carpentry, and general fabrication. This free online simulator measures angles from 0° to 180° using an interactive rotating arm with a 1° least count.
Step 1: Place the centre point of the protractor at the vertex of the angle. Step 2: Align the baseline (0° line) with one arm of the angle. Step 3: Read the scale where the second arm crosses the protractor. Check whether you need the inner or outer scale — the simulator shows both.
A semicircular protractor has two scales reading in opposite directions. The inner scale reads left-to-right (0°–180°); the outer scale reads right-to-left (180°–0°). Always confirm which scale aligns with your baseline before reading the measurement.
This simulator classifies each reading: Acute (0°–90°), Right angle (90°), Obtuse (90°–180°), and Straight angle (180°) — reinforcing angle classification alongside measurement practice.
Ideal for technical drawing students, sheet metal apprentices, carpentry trainees, and students in engineering diploma or TVET programmes who need to demonstrate accurate angle measurement in practical assessments.