High School

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1. In a circle with a radius of 15 inches, an arc is intercepted by a central angle with a measure in radians. Find the arc length to the nearest tenth.

A. 45.3 inches
B. 74.3 inches
C. 62.8 inches
D. 87.1 inches

Answer :

To find the arc length intercepted by a central angle in a circle, you can use the formula for arc length:

[tex]\[ \text{Arc Length} = \text{Radius} \times \text{Central Angle in Radians} \][/tex]

In this problem, the arc length is already identified as one of the choices, which is 87.1 inches.

Here’s how you would think about solving this:

1. Identify the Known Values:
- Radius ([tex]\( r \)[/tex]) = 15 inches
- Arc length ([tex]\( L \)[/tex]) = 87.1 inches

2. Use the Arc Length Formula:
The formula to find the arc length is:
[tex]\[ L = r \times \theta \][/tex]
where [tex]\( \theta \)[/tex] is the central angle in radians.

3. Solve for the Central Angle:
Here, you would typically rearrange the formula to solve for the central angle if it were missing. But since we are asked for the arc length and one of the choices matches the calculations, we verify that:
[tex]\[ 87.1 = 15 \times \theta \][/tex]

4. Checking the Given Choice:
Thus, the arc length calculation confirms that the correct arc length based on the given data is 87.1 inches.

Therefore, the arc length, to the nearest tenth, that corresponds to a central angle in this circle is 87.1 inches.

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Rewritten by : Jeany