How to Calculate the Area of a Circle
What is the formula to calculate the area of a circle?
Given the radius of a circle is 5 cm, what is the area of the circle?
Formula to Calculate Area of a Circle
The formula to calculate the area of a circle is πr2, where π (pi) is approximately 3.14159 and r is the radius of the circle.
Calculation
Given the radius, r = 5 cm
Area = π(5)2
Area = 3.14159(25)
Area = 78.54 cm2
To calculate the area of a circle, you need to use the formula πr2, where π (pi) is a constant approximately equal to 3.14159 and r is the radius of the circle. In the given example, with a radius of 5 cm, you can substitute the radius value into the formula and calculate the area. Simply square the radius and multiply it by π to find the area.
For a circle with a radius of 5 cm, the area would be 78.54 cm2. Remember to always include the unit squared (cm2) when expressing the area of a circle to indicate the measurement is for area.