PS Archive | Re: geomatry

if the circumference of Circle A is twice that of Circle B, then area of circle A/Area of Circle B=

A)1/2
B)2
c)4
d)2pie
e)4pie

please tell me what i am doing wrong ??

let r be A radius
A circumference =2pie r
Area=pie r^2

B circumference =2pier/2= pir r
B radius =C/2pie=pie r/2 pie=r/2
area B=pie(r/2)^2= pie r^2/4

area of Circle A/Area of Circle B= pie r^2/pie r^2 over 4 =4