Mathematics for IGCSE & O level - Scale Drawings (Section 3 - No. 23)
If the scale is 1:20, this means:
1 unit in the drawing is 20 units in reality.
20 units in the drawing is 1 unit in reality.
The object in real life is 20 times smaller.
The shape is distorted.
Forklaring
1:20 indicates the drawing is smaller than the reality.