Math.help pleaseA circle has an area of M cm2 and a circumference of N cm.If M/N= 20,what is the radius of the circle,in cm?

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Math.help pleaseA circle has an area of M cm2 and a circumference of N cm.If M/N= 20,what is the radius of the circle,in cm?
Math.help please
A circle has an area of M cm2 and a circumference of N cm.If M/N= 20,what is the radius of the circle,in cm?

Math.help pleaseA circle has an area of M cm2 and a circumference of N cm.If M/N= 20,what is the radius of the circle,in cm?
because 2*π*r=N
π*r*r=M
so M/N=r/2=20
r=40cm

M=40cm N=2cm

area=Pie r2 ~~~
circumference= 2 pie r
pie r2 除以 2 pie r = r 除以 2
M/N=20 therefore r/2=20 r=40 cm

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