What is "pi r squared?"
Credit: Stacey Newman E+ Getty Images
Q:

What is "pi r squared?"

A:

Quick Answer

The phrase "pi r squared" refers to the mathematical formula used to determine the area of a circle. Normally, the equation is written as "pi * r2," or "Π * r2.

  Know More

Full Answer

To calculate the area of a circle, it is necessary to first determine the circle's radius, which is half the distance of a straight line across the center of the circle. The formula used to determine the circle's radius is r = C / 2.

Pi is a mathematical constant representing the ratio of the circumference of a circle to its diameter, and is approximately equal to 3.14. Pi has also been represented by the Greek letter "Π" since the 18th century.

The formula used to determine the area of a circle is:

A = pi * r2 or

A = Π * r * r

Where A represents the area, r is the radius, and pi equals 3.14.

For example, the area of a circle with a diameter of 2 inches can be calculated as follows:

A = 3.14 * (2/2)2

A = 3.14 * 12

A = 3.14

In this case, the area of the circle is 3.14 inches.

The mathematical constant pi is commonly used to determine the of area and volume of geometric shapes, which can be applied to things like floor space and how much fluid a particular barrel holds in everyday life.

Learn more about Calculus

Related Questions

  • Q:

    Why is pi important?

    A:

    If the circumference or the area of a circle is known, pi can be used to find the diameter and the radius of that circle. Likewise, if the radius or diameter is known, pi can be used to find out the circumference or the area.

    Full Answer >
    Filed Under:
  • Q:

    How is calculus used in medicine?

    A:

    According to class notes from Bunker Hill Community College, calculus is often used in medicine in the field of pharmacology to determine the best dosage of a drug that is administered and its rate of dissolving. Usually, the drug is slowly dissolved in the stomach.

    Full Answer >
    Filed Under:
  • Q:

    What is the midpoint rule in calculus?

    A:

    The midpoint rule of calculus is a method for approximating the value of the area under the graph during numerical integration. This is one of several rules used for approximation during numerical integration.

    Full Answer >
    Filed Under:
  • Q:

    How do you calculate the midpoint Riemann sum?

    A:

    A Riemann sum is a method of approximating the area under the curve of a function. It adds together a series of values taken at different points of that function and multiplies them by the intervals between points. The midpoint Riemann sum uses the x-value in the middle of each of the intervals.

    Full Answer >
    Filed Under:

Explore