If the area of the red circles is 20 pi. What is the area of the yellow region?
There are 5 red circles and the total area is 20 pi
the area of ONE circle is 1/5 of 20 pi = 4 pi
area of a circle = pi r^2 area/pi = r ^2 so r = 2
The square is thus 12 x 12 = 144 sq units
Subtract the area of all NINE circles to find the yellow area
144 - 9 (pi)(2^2)=yellow
There are 5 red circles and the total area is 20 pi
the area of ONE circle is 1/5 of 20 pi = 4 pi
area of a circle = pi r^2 area/pi = r ^2 so r = 2
The square is thus 12 x 12 = 144 sq units
Subtract the area of all NINE circles to find the yellow area
144 - 9 (pi)(2^2)=yellow
As for 5 red circles the total area is 20 and since there are 5 which makes the area 1/5 for 1 cirlce.
area of a circle = pi r^2 area/pi = r ^2 so r = 2, Square is thus 12 x 12 = 144 sq units and then subtract the area of all NINE circles to find the yellow area which would be 144 - 9 (pi)(2^2), so by using this you'll find the value for yellow.
Furthermore if you want to do it by yourself then use this online area calculator but the problem is that it doesn't solve the equation step by step.