Circle Equations and Properties

This video tutorial explains how to convert a circle's equation from general to standard form. It covers identifying the center and radius, completing the square for x and y terms, factoring trinomials, and simplifying the equation. The tutorial concludes with determining the circle's center and radius and visualizing it on a graph.

What is the first step in converting the general form of a circle's equation to the standard form?

• Factor the equation

• Move the constant to the right side

• Complete the square for x and y terms

• Identify the coefficients of x and y terms

Tags

CCSS.HSG.GPE.A.1

Why do we add the same constant to both sides of the equation when completing the square?

• To convert the equation to standard form

• To make the equation easier to solve

• To keep the equation balanced

• To find the center of the circle

Tags

CCSS.HSA-REI.B.4B

What is the result of taking half of the coefficient of x and squaring it?

• A perfect square trinomial

• A constant term

• A binomial

• A simplified equation

Tags

CCSS.HSA-REI.B.4B

After completing the square, what form does the equation take?

• Factored form

• Standard form

• Simplified form

• General form

Tags

CCSS.HSG.GPE.A.1

What are the coordinates of the center of the circle in the standard form equation?

• (h, k)

• (-h, -k)

• (x, y)

• (a, b)

Tags

CCSS.HSG.GPE.A.1

How do you find the radius from the standard form equation?

• Take the square root of the constant term

• Divide the constant term by 2

• Multiply the constant term by 2

• Square the constant term

Tags

CCSS.HSG.GPE.A.1

What is the exact length of the radius before rationalizing?

• 5 divided by 2

• 5 times 2

• 5 times the square root of 2

• 5 divided by the square root of 2

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CCSS.8.G.C.9

CCSS.HSG.GMD.A.3

What is the approximate decimal value of the radius after rationalizing?

• 5.2

• 4.3

• 3.54

• 2.5

Tags

CCSS.HSG.GPE.A.1

What are the coordinates of the center of the circle in the final result?

• (-5/2, 1/2)

• (5/2, -1/2)

• (-5, 1)

• (5, -1)

Tags

CCSS.HSG.GPE.A.1

What is the purpose of rationalizing the radius?

• To convert to standard form

• To find the center

• To simplify the equation

• To make it easier to graph

Tags

CCSS.HSG.GPE.A.1