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