(3.14)*r(the
radius)
. In this case, it is
5.12 (half the diameter; the
radius) times
. 5.12*5.12*3.14=
82.3.
The area of a circle is
(3.14)*r(the
radius). In this case, it is
5.12 (half the diameter; the
radius) times
. 5.12*5.12*3.14=
82.3.
