The diameter is 10, not 10pi.mathland said:
Opalg said:
The formula for finding the area of a circle is A = πr², where A represents the area and r represents the radius of the circle.
To calculate the area of a circle, you can use the formula A = πr² or you can use the diameter of the circle (d) and the formula A = (π/4)d².
The symbol π represents the mathematical constant pi, which is approximately equal to 3.14. The letter r represents the radius of the circle, which is the distance from the center to any point on the circle's edge. The exponent ² means to multiply the radius by itself, or to square it.
To find the radius of a circle if you know the area, you can rearrange the formula A = πr² to solve for r. This would give you the formula r = √(A/π), where r represents the radius and A represents the area.
Yes, the formula A = πr² can be used for any size circle, as long as you have the correct value for the radius. This formula is a universal rule for finding the area of a circle, regardless of its size.