Ok well...
The diagram shows 2 concentric circles. The large one has a radius of 5cm and the smaller one has a radius of 3cm.
Find the ratio of the white to the shaded area..?
Can anyone help? Pleasee...
Ok well...
The diagram shows 2 concentric circles. The large one has a radius of 5cm and the smaller one has a radius of 3cm.
Find the ratio of the white to the shaded area..?
Can anyone help? Pleasee...
Hi adeshSB,
The area of the shaded area is $\displaystyle 9 \pi$ using $\displaystyle A=\pi r^2$
The area of the bigger circle is $\displaystyle 25 \pi$ using the same reasoning.
The difference between these areas is the area of the white part which would be $\displaystyle 25 \pi - 9 \pi = 16 \pi$
The ratio of the white to the shaded area would then be:
$\displaystyle \frac{16 \pi}{9 \pi}=\frac{16}{9}$