\( 128 \pi=\frac{1}{3} \pi x^{2}(24) \)
\( x = \sqrt{16} = 4 \)
Step 1 :\( 128 \pi = \frac{1}{3} \pi x^{2} (24) \)
Step 2 :\( 128 = \frac{1}{3} x^{2} (24) \)
Step 3 :\( x^{2} = \frac{128 \times 3}{24} = 16 \)
Step 4 :\( x = \sqrt{16} = 4 \)