### Instruction: What is the number of square meters in the area of a circle with diameter 4 meters? Express your answer in terms of $\pi$.### Response: We know that the area of a circle is $\pi r^2$.
Yes. We also know that the radius is half of the diameter.
That's true. So if the diameter is 4 meters, the radius is 2 meters.
So the area of the circle would be $\pi (2)^2$.