Area of Circle Sectors

This tutorial explains how to find the area of a circle sector by identifying the fraction of the circle that is shaded and multiplying it by the total area of the circle. It provides examples with different sector angles and demonstrates the calculation process using a specific example with a given radius and pi value.

What is the first step in finding the area of a circle sector?

• Calculate the circumference of the circle

• Identify the fraction of the circle that is shaded

• Measure the diameter of the circle

• Find the radius of the circle

How is the area of a circle calculated?

• By multiplying pi by the diameter

• By multiplying pi by the radius squared

• By dividing the circumference by pi

• By adding the radius and diameter

What fraction of the circle is shaded if the sector is 180°?

• 1/2

• 1/3

• 1/4

• 3/4

If a sector is 90°, what fraction of the circle does it represent?

• 1/2

• 1/4

• 3/4

• 1/3

What is the degree measure of a sector that represents 3/4 of a circle?

• 270°

• 180°

• 360°

• 90°

In the example calculation, what is the degree measure of the sector?

• 120°

• 90°

• 180°

• 270°

What fraction of the circle does a 120° sector represent?

• 1/3

• 1/4

• 1/2

• 3/4

What value is used for pi in the example calculation?

• 3.00

• 3.14

• 3.50

• 3.75

What is the radius of the circle used in the example calculation?

• 4 ft

• 2 ft

• 3 ft

• 5 ft

What is the first mathematical operation performed after substituting the values in the example?

• Dividing by pi

• Squaring the radius

• Subtraction

• Addition