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# Focal Diameter of a Parabola Calculator Online

The Focal Diameter of a Parabola Calculator calculates the focal diameter of a parabola given its equation. This tool is useful in many fields, such as physics, engineering, and computer graphics, where precise measurements of parabolic shapes are necessary.

## Formula of Focal Diameter of a Parabola Calculator

For a parabola with the equation y^2 = 4ax (opening right or left) or x^2 = 4ay (opening up or down), the focal diameter can be calculated as follows:

Where:

• a is the distance from the vertex to the focus of the parabola.

Explanation: In the equation y^2 = 4ax, a represents the distance from the vertex to the focus along the x-axis. The focal diameter is the length of the line segment passing through the focus and parallel to the directrix, which is always equal to 4a. Similarly, in the equation x^2 = 4ay, a represents the distance from the vertex to the focus along the y-axis, and the focal diameter is 4a.

## Table for General Terms

Here is a table with pre-calculated focal diameters for common values of a:

This table helps quickly find the focal diameter without performing calculations each time.

## Example of Focal Diameter of a Parabola Calculator

Let's go through an example to demonstrate how to use the Focal Diameter of a Parabola Calculator.

Example: Given a parabola with the equation y^2 = 12x, find the focal diameter.

Step 1: Identify the value of a. In this equation, 4a = 12, so a = 3.

Step 2: Use the formula to find the focal diameter. Focal Diameter = |4a| = 4 * 3 = 12.

So, the focal diameter of the parabola y^2 = 12x is 12.

## Most Common FAQs

How do I find the value of a in the parabola equation?

In the equation y^2 = 4ax or x^2 = 4ay, the value of a can be found by dividing the coefficient of x or y by 4.

Why is the focal diameter important?

The focal diameter is important because it helps in understanding the geometric properties of the parabola and is used in various applications, such as designing satellite dishes and car headlights.