Question

a farmer needs to find the area of a circular crop field with a radius of 100 meters. which formula should the farmer use? a = 2πr a = (1/2)bh a = πr^2 a = lw

Explanation:

• \(A = 2\pi r\) is the formula for the circumference of a circle, not the area.
• \(A=\frac{1}{2}bh\) is the formula for the area of a triangle.
• \(A = lw\) is the formula for the area of a rectangle.
• \(A=\pi r^{2}\) is the well - known formula for the area of a circle, where \(r\) is the radius of the circle. Since the crop field is circular, this is the appropriate formula.

Answer:

C. \(A=\pi r^{2}\)