Step 1: Identify the known or given information.

Step 2: Set up a formula for the sector area

NOTE: A ratio will need to be constructed. Recall that a circle is composed

of 360 degrees. Therefore, the following ratio can be made,

\frac{\theta}{360} = \frac{\text{sector area} (A_C)}{\text{Total area} (A_T)}

Sector area = \frac{\theta}{360} * \pi r^2 (since area = \pi r^2)

where, \theta = Central angle.

Step 3: Plug the sector’s central angle measurement into the formula.

Step 4: Plug the sector’s radius measurement into the formula.

Step 5: Solve for the area:

EXAMPLE: Sector area = \frac{\theta}{360} * \pi r^2 (since area = \pi r^2)

Sector area = \frac{60}{360}*\left(3.14\right)\left(5\right)^2

Sector area = 13.09 cm^2