Question

There are two concentric circles with outer circle of radius 24cm.If area of inner circle is one third of area between the circles, the ratio of circumference of two circles is

4 : 1
2 : 1
8 : 1
6 : 1​

Answer 1

Answer:

There are two concentric circles such that the area of the outer circle is four times the area of the inner circle. Let A, B and C be three distinct ...

Solution: `piR^2=4pir^2` `R^2=4r^2` `R=2r` `In/_AOD` `(AD)^2+(OD)^2=(OA)^2` `(AD)^2=4r^2-r^2=3r^2` `AD=sqrt3r` `AB=2sqrt3r` `Area of /_ABC=sqrt3/4(2sqrt ......