R=8,4 e=25см P=2,2*10

It looks like you're providing some values that might be related to a specific problem or formula. Could you please clarify what these variables represent? For example:

• Is \( R \) a radius?
• Does \( e \) represent an edge length or another measurement?
• What does \( P \) stand for in your context?

Once you provide this information, I can help you further with calculations or explanations related to your university exam preparation.