5 Examples of Arc Length
Arc length is a fundamental concept in geometry and trigonometry, representing the distance along the curved line of a circle or any other curved shape.
In this article, we will explore ten solved examples of arc length in mathematics.
Examples of Arc Length
These are 5 examples of arc length.
1: Finding the Arc Length of a Quarter Circle
Example
Given a quarter circle with a radius of 4 units, find the arc length from the starting point to the end.
Solution
The formula for calculating the arc length of a quarter circle is,
L = (π * r) / 2, where “r” is the radius
L = (π * 4) / 2 L = (4π) / 2 L = 2π
So, the arc length of the quarter circle is 2π units.
2: Calculating the Arc Length of a Half Circle
Example
Given a semicircle with a radius of 5 cm, find the arc length from the starting point to the end.
Solution
The formula for calculating the arc length of a semicircle is,
L = (π * r), where “r” is the radius
L = π * 5 L = 5π
So, the arc length of the semicircle is 5π cm.
3: Arc Length of a Circle Sector
Example
Find the arc length of a circle sector with a central angle of 60 degrees and a radius of 7 inches.
Solution
The formula for calculating the arc length of a circle sector is,
L = (θ/360) * 2πr, where “θ” is the central angle, and “r” is the radius
L = (60/360) * 2π * 7 L = (1/6) * 14π L = (7/3)π
So, the arc length of the circle sector is (7/3)π inches.
4: Calculating Arc Length Using Trigonometry
Example
Given a circle with a radius of 10 units and a central angle of 45 degrees, find the arc length between the two points.
Solution
Use the formula L = rθ,
where “r” is the radius and “θ” is the central angle in radians
First, convert 45 degrees to radians: θ = (45/180) * π θ = (1/4) * π
Now,
L = 10 * (1/4) * π L = (10/4)π L = (5/2)π
So, the arc length is (5/2)π units.
5: Finding the Arc Length of a Curved Road
Example
Given a curved road with a radius of 100 meters and a central angle of 30 degrees, find the arc length of the road between two points.
Solution
Use the formula L = rθ,
where “r” is the radius and “θ” is the central angle in radians
First, convert 30 degrees to radians: θ = (30/180) * π θ = (1/6) * π
Now,
L = 100 * (1/6) * π L = (100/6)π L = (50/3)π
So, the arc length of the curved road is (50/3)π meters
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