Answer :
Area= pi*r^2
So since the radius is half of the diameter, you need to divide 40/2=20
radius = 20
pi*20^2
20^2=400
pi= 3.1415...
pi*400=1256.63706...
So area will equal =1256.63706..., (since pi is never ending)
{ I might be wrong.]
So since the radius is half of the diameter, you need to divide 40/2=20
radius = 20
pi*20^2
20^2=400
pi= 3.1415...
pi*400=1256.63706...
So area will equal =1256.63706..., (since pi is never ending)
{ I might be wrong.]