Calculate the area of a circle whose diameter is 7cm
The radius of a circle is half of its diameter. Therefore, the radius of this circle is 7cm/2 = <<7/2=3.5>>3.5cm.
The area of a circle can be calculated using the formula A = πr^2, where A represents the area and r represents the radius.
Substituting the values, we have A = π(3.5)^2 = π(12.25) ≈ 38.484 cm².
Therefore, the area of the circle is approximately 38.484 square centimeters.
To calculate the area of a circle, we can use the formula:
Area = π * (radius)^2
Since the diameter is given, we need to find the radius first. The radius of a circle is half its diameter.
Given Diameter = 7cm
Radius = Diameter / 2 = 7cm / 2 = 3.5cm
Now we can substitute the value of the radius into the formula to calculate the area:
Area = π * (3.5cm)^2
Area = π * 12.25cm^2
Area ≈ 38.48 cm^2 (rounded to two decimal places)
Therefore, the area of the circle with a diameter of 7cm is approximately 38.48 cm^2.
To calculate the area of a circle, you can use the formula:
Area = π * r^2
In this case, you are given the diameter, which is 7cm. The radius (r) of a circle is half of its diameter, so divide the diameter by 2 to find the radius:
r = diameter/2 = 7cm/2 = 3.5cm
Now, substitute the value of the radius into the formula:
Area = π * r^2 = π * (3.5cm)^2
Note that the value of π (pi) is approximately 3.14159, but you can use a more accurate approximation if needed.
Calculating the area:
Area ≈ 3.14159 * (3.5cm)^2
Area ≈ 3.14159 * 12.25cm^2
Area ≈ 38.484 cm^2
Therefore, the area of a circle with a diameter of 7cm is approximately 38.484 square centimeters.