In Exercises 31–40, write the standard form of the equation of the circle with the given center and radius. Center (-4, 0), r = 10

Key Concepts

Standard Form of a Circle's Equation

The standard form of a circle's equation is given by (x - h)² + (y - k)² = r², where (h, k) is the center of the circle and r is the radius. This format allows for easy identification of the circle's center and radius, facilitating graphing and analysis.

Coordinates of the Center

The center of a circle is represented by the coordinates (h, k). In this case, the center is (-4, 0), meaning the circle is positioned 4 units to the left of the origin along the x-axis and at the origin along the y-axis. Understanding the center's coordinates is crucial for accurately writing the equation.

Radius of a Circle

The radius of a circle is the distance from the center to any point on the circle. In this problem, the radius is given as r = 10, indicating that the circle extends 10 units in all directions from its center. This value is essential for determining the right side of the standard form equation.