# Common Core: High School - Geometry : Expressing Geometric Properties with Equations

## Example Questions

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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?

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

What is the equation of the circle shown below?

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

What is the equation of the circle shown below?

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

What is the equation of the circle shown below?

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, 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 #1 : Expressing Geometric Properties With Equations

What is the equation of the circle shown below?

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,

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 #1 : Expressing Geometric Properties With Equations

What is the equation of the circle shown below?

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, 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 : Expressing Geometric Properties With Equations

What is the equation of the circle shown below?

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, 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 #1 : Expressing Geometric Properties With Equations

What is the equation of the circle shown below?

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, 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 #2 : Expressing Geometric Properties With Equations

What is the equation of the circle shown below?

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, 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 #1 : Expressing Geometric Properties With Equations

What is the equation of the circle shown below?





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, 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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