To calculate the area of a circle, we use the formula:
A = π r²
where:
- A is the area of the circle.
- π is the constant pi, approximately equal to 3.14159.
- r is the radius of the circle.
Given a circle with a radius of 5 cm, we can substitute the values into our formula:
A = π (5 cm)²
Now, we need to square the radius (5 cm), which means we multiply it by itself:
5 cm 5 cm = 25 cm²
So our formula now is:
A = π 25 cm²
Using the approximate value of π, 3.14159, the area becomes:
A = 3.14159 * 25 cm²
A = 78.53975 cm² (rounded to five decimal places)
Since the choices provided in the options (OA to OD) do not have the value we obtained, the correct area of the circle is 78.54 cm² (rounded to two decimal places), which is not listed among the options provided in the question.
