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A circle has a circumference of 
6pi feet (ft). An arc, 
x, in this circle has a central angle of 
50^(@). Rounded to the nearest tenth of a foot, what is the length of 
x ?

A circle has a circumference of 6π 6 \pi feet (ft) (\mathrm{ft}) . An arc, x x , in this circle has a central angle of 50 50^{\circ} . Rounded to the nearest tenth of a foot, what is the length of x x ?

Full solution

Q. A circle has a circumference of 6π 6 \pi feet (ft) (\mathrm{ft}) . An arc, x x , in this circle has a central angle of 50 50^{\circ} . Rounded to the nearest tenth of a foot, what is the length of x x ?
  1. Find Radius using Circumference: Find the radius of the circle using the circumference.\newlineThe formula for the circumference of a circle is C=2πrC = 2 \pi r, where CC is the circumference and rr is the radius.\newlineGiven C=6πC = 6\pi, we can solve for rr:\newline6π=2πr6\pi = 2 \pi r\newlineDivide both sides by 2π2\pi to isolate rr:\newliner=6π2πr = \frac{6\pi}{2\pi}\newliner=3r = 3
  2. Calculate Length of Arc: Calculate the length of the arc xx.\newlineThe length of an arc (ss) in a circle is given by the formula s=rθs = r \cdot \theta, where rr is the radius and θ\theta is the central angle in radians.\newlineFirst, convert the central angle from degrees to radians. The conversion factor is π\pi radians =180= 180 degrees.\newlineθ=(50 degrees)(π radians180 degrees)\theta = (50 \text{ degrees}) \cdot \left(\frac{\pi \text{ radians}}{180 \text{ degrees}}\right)\newlineθ=(50180)π\theta = \left(\frac{50}{180}\right) \cdot \pi\newlineθ=(518)π\theta = \left(\frac{5}{18}\right) \cdot \pi
  3. Use Radius and Central Angle: Use the radius and the central angle in radians to find the length of the arc.\newlines=rθs = r \cdot \theta\newlines=3(518π)s = 3 \cdot \left(\frac{5}{18} \cdot \pi\right)\newlines=35π18s = \frac{3 \cdot 5 \cdot \pi}{18}\newlines=15π18s = \frac{15\pi}{18}\newlineSimplify the fraction by dividing both numerator and denominator by 33:\newlines=5π6s = \frac{5\pi}{6}
  4. Convert Length of Arc to Decimal: Convert the exact length of the arc to a decimal and round to the nearest tenth.\newlines \approx \frac{(55 \times 33.1415914159)}{66}\newlines \approx \frac{1515.7079570795}{66}\newlines \approx 22.6179961799\newlineRounded to the nearest tenth:\newlines \approx 22.66 feet

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