what is the area of the sector of a circle with a central angle of 168 degrees and a radius of 15 inches?

1 answer

To find the area of a sector of a circle, you can use the formula:

\[ \text{Area of the sector} = \frac{\theta}{360^\circ} \times \pi r^2 \]

where:

  • \(\theta\) is the central angle in degrees,
  • \(r\) is the radius of the circle.

Given:

  • \(\theta = 168^\circ\)
  • \(r = 15\) inches

Now, substitute these values into the formula:

\[ \text{Area of the sector} = \frac{168}{360} \times \pi \times (15)^2 \]

First, calculate \(15^2\):

\[ 15^2 = 225 \]

Now plug that into the formula:

\[ \text{Area of the sector} = \frac{168}{360} \times \pi \times 225 \]

Calculating \(\frac{168}{360}\):

\[ \frac{168}{360} = \frac{14}{30} = \frac{7}{15} \]

Now, substitute this back into the equation:

\[ \text{Area of the sector} = \frac{7}{15} \times \pi \times 225 \]

Next, calculate \(\frac{7}{15} \times 225\):

\[ \frac{7 \times 225}{15} = \frac{1575}{15} = 105 \]

Therefore, the area of the sector is:

\[ \text{Area of the sector} = 105\pi \text{ square inches} \]

If you would like a numerical approximation, using \(\pi \approx 3.14\):

\[ 105\pi \approx 105 \times 3.14 \approx 329.7 \text{ square inches} \]

Thus, the area of the sector of the circle is \(105\pi\) square inches, or approximately \(329.7\) square inches.