Subject :IMO Class : Class 8
A wire of length l units is bent to form a circle. Then ratio of radius of the circle to the area of the circle so formed is _____.
A2π : l
Bl : π
C2 : l
D4 : 3l
Ans 1:
Class : Class 8
Answer is C.
Circumference of the circle will be equal to l (the wire forms the circle)
2 * 22/7 * r = l , r = l/44/7
Area = 22/7 * r * r = 22/7 * l/44/7 * l/44/7 = l*l/4*44/7
Therefore radius : area = l/44/7 : l*l/4*44/7 = 2 : l
Hope it helped!
Ans 2:
Class : Class 8