3. Fig. depicts an archery target marked with its five scoring regions from the centre outwards as Gold, Red, Blue, Black and White. The diameter of the region representing Gold score is 21 cm and each of the other bands is 10.5 cm wide. Find the area of each of the five scoring regions.
Radius of each scoring region can be found by adding 10.5 in respective colours.
The area of golden region is :
Similarly area of the red region is = Area of red score - Area of golden region
Then area of blue region is :
And area of the black region is :
Area of the white region is :