MCQ
If $\text{A}=\pi(\text{R}^2-\text{r}^2)$ than R is equal to.
- A$\sqrt{\frac{\text{A}-\pi\text{r}^2}{\pi}}$
- ✓$\sqrt{\frac{\text{A}+\pi\text{r}^2}{\pi}}$
- C$\sqrt{\frac{\text{r}^2\pi-\text{A}}{\pi}}$
- D$\sqrt{\frac{\text{r}^2\pi-\text{A}}{\text{r}}}$
