Since the radius of the circle is 3 and the length of arc LM is 1/3(π), the area shaded above is equal to 7.5π square units.
In Mathematics and Geometry, the area of a sector in terms of radians can be calculated by using the following formula:
Area of sector = 1/2 ×
θ
Where:
- r represents the radius of a circle.
- θ represents the central angle.
Note: The measure of an intercepted arc is equal to the central angle of a circle.
Central angle = 2π - π/3
Central angle = 5π/3
By substituting the given parameters into the area of a sector formula, we have the following;
Area of sector = 1/2 ×
θ
Area of sector A = 1/2 ×
× 5π/3
Area of sector A = 1/2 × 3 × 5π
Area of sector A = 7.5π square units.