di ketahui tinggi tabung 18 cm dan jari-jari 7cm hitung luas permukaan bandul pakai cara
= L. alas + L. selimut + L. ½Bola
[tex] \tt = \pi {r}^{2} + \pi dt + \frac{1}{\not2} \times {\not4}^{2} \times \pi {r}^{2} [/tex]
[tex] \tt = \frac{22}{7} \times {7}^{2} + \frac{22}{7} \times 14 \times 18 + 2 \times \frac{22}{7} \times {7}^{2} [/tex]
[tex] \tt = \frac{22}{7} \times 49 + \frac{5.544}{7} + \frac{44}{7} \times 49[/tex]
[tex] \tt = \frac{1.078}{7} + 792 + \frac{2.156}{7} [/tex]
= 154 + 792 + 308 cm²
= 1.254 cm²
[tex]\purple{\boxed{\blue{\boxed{\green{\star{\orange{\ \: \: \mathcal{JK} \: \: \: {\green{\star}}}}}}}}} [/tex]
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