Luas bangun disamping adalah....dm3

[tex]l \: = \frac{1}{4} \times \pi \times {r}^{2} \\ \\ l = \frac{1}{4} \times \frac{22}{7} \times {7}^{2} \\ \\ l = \frac{1}{4} \times \frac{22}{7} \times 49 \\ \\ l = \frac{1}{4} \times 22 \times 7 \\ \\ l = \frac{154}{4} \\ \\ l = 38.5 \: {dm}^{2} [/tex]