Calculate the area of a circle when its diameter is

a) 3.0 m

Answer: The area of the circle is m[[$ ^2 $]].

b) 16.0 m

Answer: The area of the circle is m[[$ ^2 $]].

c) 25.4 m

Answer: The area of the circle is m[[$ ^2 $]].

d) 210,0 m

Answer: The area of the circle is m[[$ ^2 $]].