Hi

two concentric circles with outer circle having a radius of "10cm."

Let r be the radius of the smaller inner circle:

Question States:

πr^2 = (1/2)π(10cm)^2

 r^2 = 50

  r =  √50 = 5√2

the border between the two concentric circles circles:

 a circle with r =  5√2cm

Wish You the Best in your Studies

 

RELATED QUESTIONS

There are two circles, one circle is inscribed and another circle is circumscribed over a  (answered by ajmisra)

Two concentric circles are drawn so that the inner circle is shaded. The shaded area is... (answered by josgarithmetic)

How do I solve this?
Q. Given two concentric circles, find the length of the radius of... (answered by DrBeeee)

How do I solve the radius of a circle of two circles together one outer and one inner if... (answered by josgarithmetic)

An archery target is constructed of four concentric circles such that the area of the... (answered by KMST)

In a figure in the shape of a circle, the radius of the inner circle is 1cm and that of... (answered by ikleyn)

Diagram of circle with outer edge shaded.  The outer circle has diameter 8 inches. The... (answered by josgarithmetic,MathTherapy)


Two circles have the same center but one circle has a radius 5 cm greater than the... (answered by Boreal)

	
Two circles have the same center but one circle has a radius 6 cm greater than the... (answered by ankor@dixie-net.com)