Approximating \( \pi \approx 3.14 \), the area is \( 25 \times 3.14 = 78.5 \) square cm.
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- \( 2\pi r = 31.4 \).
- Thus, \( r = \frac{31.4}{2\pi} \approx \frac{31.4}{6.28} = 5 \) cm.
- The area is \( \pi r^2 = \pi \times 5^2 = 25\pi \).
- #### 78.51.
- A chemistry lab requires 4.5 liters of a solution that is 30% sodium chloride. The lab currently has a 60% sodium chloride solution. How many liters of the 60% solution must be diluted with water to achieve the desired concentration?
- To find out how many liters of the 60% solution are needed, set up the equation:
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