Find the area of a circle with a diameter of 4

A = 4pi or approximately 12.56

Step-by-step explanation:

The area of a circle is given by

A = pi r^2

We need to find the diameter

r = d/2

r = 4/2 = 2

A = pi (2) ^2

A = pi (4)

A = 4pi

We can approximate pi by 3.14

A = 3.14*4 = 12.56

12.56

Step-by-step explanation:

The formula for finding the area of a circle is π*r²

to get the radius you half the diameter.

half of 4 is 2 then you square the radius which gets you to 4 again

then multiply 4 by 3.14 or PI

after you do that you should get the answer 12.56