Construct the angle of different measures
Measure the diameter of the circle
Measure the length of chord
Measure area of a sector
.
Measure the length of the drawing object
Measure the representative fraction
Compare and draw in two units
Calculate maximum length of scale
Ratio to object size to drawing size
Ratio to drawing size to object size
Maximum length of scale
Minimum length of scale
Plain scale
Vernier scale
Diogonal scale
Scale of chord
2:1
3:1
1:3
1:2