Question 751985
We need the radius for both calculations. The radius can be found using the center and any point on the edge.


{{{
d=sqrt((x[2]-x[1])^2+(y[2]-y[1])^2)
}}}

{{{
d=sqrt((7-1)^2+(10-2)^2)=10
}}}



{{{
A[circle]=pi*r^2
}}}

{{{
A[circle]=pi*10^2=314
}}}

{{{
C=2Pi*r=628
}}}


{{{
drawing( 500, 500, -10, 14, -10, 14,
  grid( 1 ),
  circle( 1, 2, 10 ))
}}}



:)