#### 78.5 (using \(\pi \approx 3.14\))Certainly! Here are 10 more challenging math questions along with their step-by-step solutions:
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- Solve for r: \(31.4 = 2\pi r \Rightarrow r = \frac{31.4}{2\pi} \approx 5\)
- Area formula: \(A = \pi r^2\)
- Calculate area: \(A \approx \pi (5)^2 = 25\pi \approx 78.5\) square meters
- A rectangle has a length that is 4 times its width. If the perimeter of the rectangle is 90 meters, what is the area of the rectangle?
- Then, the length is
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