Mathematics for IGCSE & O level - Similarity (Section 1 - No. 42)
For two shapes to be similar, which of the following conditions must be met?
All corresponding sides must have proportional lengths.
All corresponding angles must be equal.
The shapes must have the same orientation.
The shapes must have the same area.
Explanation
For two shapes to be similar, all corresponding sides must be proportional in length and all corresponding angles must be equal.