#### 150
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- \( S_n = \frac{n}{2} \times (a + l) \) where \( n = 25 \), \( a = 2 \), and \( l = 50 \).
- \( S_n = \frac{25}{2} \times (2 + 50) = \frac{25}{2} \times 52 = 25 \times 26 = 650 \).
- #### 650
- \( A = \frac{1}{2} \times 10 \times 15 = 5 \times 15 = 75 \) cm².
- #### 100
- \( V = \pi \times 3^2 \times 10 = \pi \times 9 \times 10 = 90\pi \) cm³.
