Answer:
D.
Step-by-step explanation:
We have been given that diameter of a circle is 20 units.
To find the area of our given circle we will use area of circle formula.
, where r represents radius of circle.
let us find the radius of our given circle by dividing diameter by 2 as diameter is 2 times radius.
Upon substituting r=5 in area of circle formula we will get,
Therefore,the exact area of our given circle is square units and option D is the correct choice.