# Formula for diameter of a circle

#### Vast

How do you get the diameter of a circle from the area alone? Can this be done?

#### Curious3141

Homework Helper
Sure. $$d = 2\sqrt{\frac{A}{\pi}}$$ where d is the diameter and A is the area.

#### Vast

excellent! thank you Curious

### Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving