In the realm of geometry, the equation of a circle holds the key to understanding its fundamental properties. This article delves into the intriguing world of circles, focusing on a specific equation—x² + y² + 8x − 6y + 21 = 0.

Our journey will unravel the mysteries concealed within this mathematical expression, ultimately revealing the radius that defines the circle it represents.

Table of Contents

## Understanding the General Form

The equation x² + y² + 8x − 6y + 21 = 0 is presented in a general form that encapsulates the essential components of a circle.

The terms involving x and y, namely 8x and -6y, contribute to the circle’s position in the Cartesian plane. The constant term, 21, completes the equation, adding intricacies to the circle’s characteristics.

## Completing the Square

To gain insights into the equation, we can employ a technique known as completing the square. This method transforms the equation into a more revealing form that facilitates the extraction of vital information, including the circle’s center and radius.

(x+4) 2 + (y−3) 2 =2

This transformation unveils the center of the circle as (-4, 3), and the constant term 2 on the right side provides a crucial piece of information—the squared radius.

## The Formula for the Radius

The formula for the radius (r) of a circle, derived from its completed square form, is as follows:

R2=2

**Taking the square root of both sides of the equation yields the actual radius**

r = 2

Therefore, the radius of the circle defined by the equation x² + y² + 8x − 6y + 21 = 0 is √2.

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## Graphical Representation

Let’s map the circle’s radius and center on the Cartesian plane to better visualize it. The radius is √2 units in all directions, and the center, (-4, 3), becomes the focal point. What Is the Radius of A Circle Whose Equation Is X2+Y2+8x−6y+21=0

The geometric explanation becomes clear when we draw the circle. What Is the Radius of A Circle Whose Equation Is X2+Y2+8x−6y+21=0. There are indeed √2 units separating any point on the circle from the center.

This graphic depiction is in perfect harmony with the algebraic derivation, so highlighting the mutually beneficial relationship between algebra and geometry.

## Applications in Real-World Scenarios

There are practical applications for knowing the equation of a circle and its radius outside of the field of mathematics. Circular shapes and their characteristics are relevant in disciplines including computer science, engineering, and physics.

For example, the radius of a circle can be used to model a satellite’s coverage area in satellite communication, where the radius determines the size of the signal range.

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## Conclusion

In our mathematical odyssey, we embarked on a journey to decipher the intricacies concealed within the equation x² + y² + 8x − 6y + 21 = 0. Through the process of completing the square, we unraveled the circle’s center, (-4, 3), and unveiled its radius, √2.

The amalgamation of algebraic manipulation and geometric intuition allowed us to demystify the mathematical expression and extract valuable insights about the circle it represents. What Is the Radius of A Circle Whose Equation Is X2+Y2+8x−6y+21=0

As we conclude this exploration, we acknowledge the elegance inherent in the interplay between mathematical equations and their geometric interpretations.

The equation of a circle, with its nuanced components, serves as a gateway to understanding the beauty and precision that characterize the world of mathematics.