Question

please solve question fast

it is urgent

Answer 1

Let the radius of the largest of the three concentric circle be r.

Given that radius of the circle = 20cm.

Given that 3 more concentric circles are drawn inside it in such a manner that it is divided into four parts of equal area.

Area of the circle = 3/4 * Area of the given circle

pir^2 = 3/4 * pir^2

pir^2 = 3/4 * pi(20)^2

r^2 = 3/4 * 400

r^2 = 300

$r = \sqrt{300}$

$r = 10 \sqrt{3}$


Therefore the largest of three concentric circles = $10 \sqrt{3}$


Hope this helps!