The diameter of a circle is 25 m. Find its area to the nearest whole number.
The diameter of a circle is twice the length of its radius. Therefore, if the diameter is 25 m, the radius is 25 / 2 = <<25/2=12.5>>12.5 m.
The area of a circle is given by the formula A = πr^2, where A is the area and r is the radius.
Plugging in the values, we get A = π(12.5)^2
Calculating, we find A ≈ 3.14159 × 156.25 ≈ 490.87
Rounding to the nearest whole number, the area of the circle is 491 square meters.