Breakdown of Постер и отпечаток имеют одинаковый размер.
Questions & Answers about Постер и отпечаток имеют одинаковый размер.
Because they form a compound subject: Постер и отпечаток = the poster and the print.
In Russian, two singular nouns joined by и normally take a plural verb, so:
- постер и отпечаток имеют
- not постер и отпечаток имеет
So имеют is the correct 3rd person plural form of иметь.
Russian is treating size as one shared property.
The idea is not they have same sizes but they have the same size. So Russian uses the singular:
- одинаковый размер = the same size
Also, одинаковый is singular because it agrees with размер, not with постер и отпечаток.