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A circular track has an area of 4,900yd24,900\,\text{yd}^2. Alex ran around the whole track three times. How many yards did Alex run, to the nearest hundredth of a yard?

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Q. A circular track has an area of 4,900yd24,900\,\text{yd}^2. Alex ran around the whole track three times. How many yards did Alex run, to the nearest hundredth of a yard?
  1. Circle Area Formula: Determine the formula for the area of a circle.\newlineThe area of a circle is given by the formula A=πr2A = \pi r^2, where AA is the area and rr is the radius of the circle.
  2. Radius Calculation: Solve for the radius of the circular track using the given area.\newlineWe are given that the area A=4,900A = 4,900 square yards. We can rearrange the formula to solve for rr:\newliner=Aπr = \sqrt{\frac{A}{\pi}}
  3. Radius Calculation Result: Calculate the radius of the circular track.\newliner=4,900πr = \sqrt{\frac{4,900}{\pi}}\newliner4,9003.14159r \approx \sqrt{\frac{4,900}{3.14159}}\newliner1,560.79r \approx \sqrt{1,560.79}\newliner39.50r \approx 39.50 yards
  4. Circle Circumference Formula: Determine the formula for the circumference of a circle.\newlineThe circumference CC of a circle is given by the formula C=2πrC = 2\pi r, where CC is the circumference and rr is the radius of the circle.
  5. Circumference Calculation: Calculate the circumference of the circular track using the radius.\newlineC=2πrC = 2\pi r\newlineC2×3.14159×39.50C \approx 2 \times 3.14159 \times 39.50\newlineC248.05C \approx 248.05 yards
  6. Total Distance Calculation: Calculate the total distance Alex ran.\newlineSince Alex ran around the track three times, the total distance DD he ran is:\newlineD=3×CD = 3 \times C\newlineD3×248.05D \approx 3 \times 248.05\newlineD744.15D \approx 744.15 yards
  7. Total Distance Rounding: Round the total distance to the nearest hundredth of a yard. \newlineD744.15D \approx 744.15 yards (This value is already to the nearest hundredth of a yard, so no further rounding is necessary.)

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