### All Intermediate Geometry Resources

## Example Questions

### Example Question #1 : How To Find The Area Of A Sector

Find the approximate area of the shaded portion of the figure.

**Possible Answers:**

**Correct answer:**

The answer is approximately .

First, you would need to find the diameter of the circle. Use the Pythagorean Theorem to get

or

Since the diameter is 130, we divide by 2 to get 65 cm for our radius. Then the area of the circle is

Next we would find the area of each triangle:

and

Then we would subtract these from our answer above to get:

.

### Example Question #1 : How To Find The Area Of A Sector

The radius of the circle above is and . What is the area of the shaded section of the circle?

**Possible Answers:**

**Correct answer:**

Area of Circle = πr^{2} = π4^{2 }= 16π

Total degrees in a circle = 360

Therefore 45 degree slice = 45/360 fraction of circle = 1/8

Shaded Area = 1/8 * Total Area = 1/8 * 16π = 2π

### Example Question #31 : Circles

A circle has a diameter of meters. A certain sector of the circle has a central angle of . Find the area of the sector.

**Possible Answers:**

**Correct answer:**

The formula for the area of a sector is.

where is the radius and is the measure of the central angle of the sector.

We are given that the diameter of the circle is 60. Therefore its radius is simply half as long, or 30.

Substituting into our equation gives

Therefore our area is

### Example Question #32 : Circles

Find the area of a sector with a central angle of degrees and a radius of .

**Possible Answers:**

**Correct answer:**

The circle in question could be depicted as shown in the figure.

Recall the formula for finding the area of a sector of a circle:

Since the central angle and the radius are given in the question, plug them in to find the area of the sector.

Solve and round to two decimal places.

### Example Question #33 : Circles

Find the area of a sector that has a central angle of degrees and a radius of .

**Possible Answers:**

**Correct answer:**

The circle in question could be depicted as shown in the figure.

Recall the formula for finding the area of a sector of a circle:

Since the central angle and the radius are given in the question, plug them in to find the area of the sector.

Solve and round to two decimal places.

### Example Question #34 : Circles

Find the area of a sector that has a central angle of degrees and a radius of .

**Possible Answers:**

**Correct answer:**

The circle in question could be depicted as shown in the figure.

Recall the formula for finding the area of a sector of a circle:

Since the central angle and the radius are given in the question, plug them in to find the area of the sector.

Solve and round to two decimal places.

### Example Question #35 : Circles

Find the area of a sector that has a central angle of degrees and a radius of .

**Possible Answers:**

**Correct answer:**

The circle in question could be depicted as shown in the figure.

Recall the formula for finding the area of a sector of a circle:

Solve and round to two decimal places.

### Example Question #36 : Circles

Find the area of a sector that has a central angle of degrees and a radius of .

**Possible Answers:**

**Correct answer:**

The circle in question could be depicted as shown in the figure.

Recall the formula for finding the area of a sector of a circle:

Solve and round to two decimal places.

### Example Question #37 : Circles

Find the area of a sector that has a central angle of degrees and a radius of .

**Possible Answers:**

**Correct answer:**

The circle in question could be depicted as shown in the figure.

Recall the formula for finding the area of a sector of a circle:

Solve and round to two decimal places.

### Example Question #38 : Circles

Find the area of a sector that has a central angle of degrees and a radius of .

**Possible Answers:**

**Correct answer:**

The circle in question could be depicted as shown in the figure.

Recall the formula for finding the area of a sector of a circle:

Solve and round to two decimal places.