Question

Given a dart board of radius R cm, the probability that you hit the bull's eye of radius r cm is .

• A. $\frac{R}{r}$
• B. $\frac{r}{R}$
• C. r2R2

Answer 1

The correct option is C r2R2

Area of board = $\pi$ $R^2$

Area of bull's eye = $\pi$ $r^2$
Geometric Probability = $\frac{\text{Area of required region}}{\text{Total area}}$ = $\frac{r^2}{R^2}$.