The formula for the circumference of a circle is C=πd

, where C=
circumference and d=
diameter. It can also be defined as C=2πr
, where r=
radius. If 360 degrees =2π
radians, and the formula for arc length is θ=sr
, then determine the length created by a 60-degree central angle in a circle with a 2-inch diameter and explain how you found it. Answer in 3–5 sentences.

1 answer

To find the arc length created by a 60-degree central angle in a circle with a 2-inch diameter, we first need to convert the angle from degrees to radians. Since 360 degrees is equivalent to \(2\pi\) radians, 60 degrees is \(\frac{60}{360} \times 2\pi = \frac{\pi}{3}\) radians.

Next, we can use the formula for arc length, \(s = \theta \cdot r\), where \(r\) is the radius. The radius \(r\) of our circle is half of the diameter, so \(r = 1\) inch. Therefore, substituting in the values, we have:

\[ s = \left(\frac{\pi}{3}\right) \cdot 1 = \frac{\pi}{3} \text{ inches}. \]

Thus, the length of the arc created by a 60-degree angle in this circle is \(\frac{\pi}{3}\) inches.