To calculate πr², which represents the area of a circle, you need to multiply the value of pi (π) by the square of the radius (r).
Here's a breakdown:
- π (pi): This is a mathematical constant approximately equal to 3.14159. For most calculations, 3.14 is a sufficient approximation.
- r (radius): This is the distance from the center of the circle to any point on its edge.
- r² (radius squared): This means the radius multiplied by itself (r * r).
Formula:
Area of a circle = π * r²
Steps:
- Find the radius (r) of the circle.
- Square the radius (r²): Multiply the radius by itself.
- Multiply by pi (π): Multiply the result from step 2 by π (approximately 3.14).
Example:
Let's say the radius of a circle is 5 units.
- Radius (r) = 5
- Radius squared (r²) = 5 * 5 = 25
- Area = π r² = 3.14 25 = 78.5
Therefore, the area of the circle is approximately 78.5 square units.
