Circle - Area and Equation to Diameter (Pi Value)

Question

If the area of this circle is 4, what is its diameter?

$$A=\pi \cdot (\frac{d}{2})^2 \ 4=\pi \cdot (\frac{d}{2})^2$$

Accepted Answer

$$d=2\cdot\sqrt{\frac{4}{\pi}}$$

Answer

$$d=4\cdot\sqrt{\frac{2}{\pi}}$$

Answer

$$d=2\cdot\sqrt{\frac{4}{2\cdot\pi}}$$

Answer

$$d=\sqrt{\frac{2\cdot\pi}{4}}$$

Practice: Area of a Circle - Area and Equation to Diameter (Pi Value)