tolong di jawab ya kakak kakak :D

<p>1. r = 7 cm</p><p>&nbsp; &nbsp; &nbsp;t = 10 cm</p><p>&nbsp; &nbsp; 𝞹 = 22/7</p><p>&nbsp; &nbsp; a. Luas alas</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;L. alas = 𝞹 x r²</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 22/7 x 7 x 7</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 154 cm²</p><p>&nbsp; &nbsp; b. Luas atas</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;L. atas = L. alas</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 154 cm²</p><p>&nbsp; &nbsp;c. Luas Selimut</p><p>&nbsp; &nbsp; &nbsp; &nbsp; L. Selimut = 2 x 𝞹 x r x t</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 2 x 22/7 x 7 x 10</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 440 cm²</p><p>&nbsp; &nbsp;d. Luas Permukaan&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; L. Permukaan = L. alas + L.atas + L.Selimut</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 154 + 154 + 440</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 748 cm²</p><p>&nbsp;</p><p>2. t = 28 cm</p><p>&nbsp; &nbsp; &nbsp;d = 14 cm</p><p>&nbsp; &nbsp; &nbsp;r = d : 2 = 14 : 2 = 7 cm</p><p>&nbsp; &nbsp; &nbsp;𝞹 = 22/7</p><p>&nbsp; &nbsp; &nbsp;L = 2𝞹r(r + t)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 2.(22/7).7(7 + 28)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 44 x 35</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 1.540 cm²</p><p>&nbsp; Jadi, Luas seng yang diperlukan adalah 1.540 cm²</p>