Common Core: High School - Geometry : Derive Circle Equation: CCSS.Math.Content.HSG-GPE.A.1

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Example Question #1 : Derive Circle Equation: Ccss.Math.Content.Hsg Gpe.A.1

What is the equation of the circle shown below?
Plot1

Possible Answers:

Correct answer:

Explanation:

In order to find the equation, we must find the coordinates of the center of the circle.

If we look at the picture,

Plot1

 

 

we can see that the center is at

The next step it to find the radius. Recall the radius is the distance from the center of the circle to any point on the edge of the circle.

From looking at the picture, we can see that the radius is 4. With this information, we can plug it into the general circle equation

The general circle equation is,

Now we substitute for , and . When we plug in the values, we get

Example Question #2 : Derive Circle Equation: Ccss.Math.Content.Hsg Gpe.A.1

What is the equation of the circle shown below?
Plot2

Possible Answers:

Correct answer:

Explanation:

In order to find the equation, we must find the coordinates of the center of the circle.

If we look at the picture,

Plot2

we can see that the center is at .

The next step it to find the radius. Recall the radius is the distance from the center of the circle to any point of the circle's edge.

From looking at the picture, we can see that the radius is 6.

With this information, we can plug it into the general circle equation.

The general circle equation is

 

Now we substitute for , , and

When we plug in the values, we get 

Example Question #3 : Derive Circle Equation: Ccss.Math.Content.Hsg Gpe.A.1

What is the equation of the circle shown below?

Plot3

 

Possible Answers:

Correct answer:
Explanation:

In order to find the equation, we must find the coordinates of the center of the circle.

If we look at the picture,

Plot3

we can see that the center is at .

The next step it to find the radius From looking at the picture, we can see that the radius is 6.

With this information, we can plug it into the general circle equation.  

The general circle equation is

Now we substitute for , , and

We plug in the values, we get 

Example Question #4 : Derive Circle Equation: Ccss.Math.Content.Hsg Gpe.A.1

What is the equation of the circle shown below?

Plot4

Possible Answers:

Correct answer:

Explanation:

In order to find the equation, we must find the coordinates of the center of the circle.

If we look at the picture,

Plot4

we can see that the center is at

The next step it to find the radius From looking at the picture, we can see that the radius is 4.

With this information, we can plug it into the general circle equation.

The general circle equation is

 

Now we substitute for , , and  

We plug in the values, we get 

Example Question #5 : Derive Circle Equation: Ccss.Math.Content.Hsg Gpe.A.1

What is the equation of the circle shown below?
Plot5

Possible Answers:

Correct answer:

Explanation:

In order to find the equation, we must find the coordinates of the center of the circle.

If we look at the picture, we can see that the center is at  

The next step it to find the radius. From looking at the picture,

Plot5

we can see that the radius is 9.

With this information, we can plug it into the general circle equation.

The general circle equation is

 

Now we substitute for , , and .

We plug in the values, we get 

Example Question #6 : Derive Circle Equation: Ccss.Math.Content.Hsg Gpe.A.1

What is the equation of the circle shown below?
Plot6

Possible Answers:

Correct answer:

Explanation:

In order to find the equation, we must find the coordinates of the center of the circle.

If we look at the picture,

Plot6

we can see that the center is at  

The next step it to find the radius From looking at the picture, we can see that the radius is 1.

With this information, we can plug it into the general circle equation.

The general circle equation is

 

Now we substitute for , , and

We plug in the values, we get 

Example Question #7 : Derive Circle Equation: Ccss.Math.Content.Hsg Gpe.A.1

What is the equation of the circle shown below?
Plot7

Possible Answers:
Correct answer:
Explanation:

In order to find the equation, we must find the coordinates of the center of the circle.  

If we look at the picture,

Plot7

we can see that the center is at

The next step it to find the radius From looking at the picture, we can see that the radius is 4.

With this information, we can plug it into the general circle equation.  

The general circle equation is

 

Now we substitute for , , and  

We plug in the values, we get 

Example Question #8 : Derive Circle Equation: Ccss.Math.Content.Hsg Gpe.A.1

What is the equation of the circle shown below?

Plot8

Possible Answers:

Correct answer:

Explanation:

In order to find the equation, we must find the coordinates of the center of the circle If we look at the picture,

Plot8

we can see that the center is at  

The next step it to find the radius. From looking at the picture, we can see that the radius is 6. With this information, we can plug it into the general circle equation.

The general circle equation is

 

Now we substitute for , , and

We plug in the values, we get 

Example Question #9 : Derive Circle Equation: Ccss.Math.Content.Hsg Gpe.A.1

What is the equation of the circle shown below?

Plot9

Possible Answers:

Correct answer:

Explanation:

 In order to find the equation, we must find the coordinates of the center of the circle.

If we look at the picture,

Plot9

we can see that the center is at

The next step it to find the radius. From looking at the picture, we can see that the radius is 2. With this information, we can plug it into the general circle equation.

The general circle equation is

 

Now we substitute for , , and  

We plug in the values, we get 

Example Question #10 : Derive Circle Equation: Ccss.Math.Content.Hsg Gpe.A.1

What is the equation of the circle shown below?

Plot10

Possible Answers:


Correct answer:

Explanation:

In order to find the equation, we must find the coordinates of the center of the circle.

If we look at the picture,
Plot10
we can see that the center is at

The next step it to find the radius. From looking at the picture, we can see that the radius is 2. With this information, we can plug it into the general circle equation.  

The general circle equation is

Now we substitute for , , and

We plug in the values, we get

 

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