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Crop circles. The expression r2 gives the area of a circle with radius r.?

Crop circles. The expression r2 gives the area of a circle
with radius r. How many square meters of wheat were
destroyed when an alien ship made a crop circle of diameter
25 meters in the wheat field at the Southwind Ranch?
Round to the nearest tenth. Find on your calculator.please show me how you came about this answer. I am confused.
Thank you.

Pi = 3.14159 ish
Anyway,
The diameter is 25m, but the radius is what you are using in your equation. The radius is half the diameter.
r = 12.5m
Now we can calculate the area:
A=Pi*r^2 = (3.14159)*(12.5m)*(12.5m)=490.87385 square meters.
Don’t forget to round to the nearest 10th:
A = 490.9 square meters (aka 490.9 m^2)

NONONO, The FIRST ANSWER IS WRONG!!! THEY USED THE DIAMETER IN THE CALCULATION!!! YOU HAVE TO USE THE RADIUS!!! DON”T LISTEN TO TWEEDLEDEE AND TWEEDLEDUM!!!!

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