Math Problem Statement

Write the standard form of the equation and the general form of the equation of the circle with radius r and center​ (h,k). Then graph the circle. requals5​;    ​(h,k)equalsleft parenthesis negative 2 comma 1 right parenthesis

Solution

The graph above shows the circle with a center at (2,1)(-2, 1) and a radius of 5. The circle is plotted according to the standard form equation:

(x+2)2+(y1)2=25(x + 2)^2 + (y - 1)^2 = 25

with its center marked in red.

Summary:

  • Standard Form: (x+2)2+(y1)2=25(x + 2)^2 + (y - 1)^2 = 25
  • General Form: x2+y2+4x2y20=0x^2 + y^2 + 4x - 2y - 20 = 0

Would you like further details or have any questions? Here are some related questions you might be interested in:

  1. How to find the equation of a tangent line to a circle?
  2. What is the relationship between the general and standard forms of a circle's equation?
  3. How to determine if a point lies inside, on, or outside a circle?
  4. How to derive the equation of a circle given three points?
  5. What is the parametric form of a circle's equation?

Tip: Understanding how to convert between the standard and general forms of a circle's equation can help in solving more complex geometry problems involving circles!

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Math Problem Analysis

Mathematical Concepts

Geometry
Equations of Circles

Formulas

Standard form of a circle's equation: (x - h)^2 + (y - k)^2 = r^2
General form of a circle's equation: x^2 + y^2 + Dx + Ey + F = 0

Theorems

Pythagorean Theorem (used to derive the distance formula for radius)

Suitable Grade Level

Grades 9-10