Length = \(2 \times 30 = 60\).
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- #### #### 3, 5
- A rectangular plot of land has a length that is twice its width. If the perimeter is 180 meters, find the area of the plot.
- Perimeter: \(2(w + 2w) = 180 \Rightarrow 6w = 180 \Rightarrow w = 30\).
- Area = \(w \times \text{length} = 30 \times 60 = 1800 \, \text{m}^2\).
- #### #### 1800
- \( S_n = 3n^2 + 5n \)
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