tolong bantu kak

<p>a). Luas tabung</p><p>Total luas permukaan = Luas alas + luas tutup + luas selimut&nbsp;</p><p>Luas alas = luas tutup</p><p>Diameter (ambil dari tinggi bola) = 14 cm, maka <strong>jari-jari</strong> alas <strong>= 7 cm</strong></p><p>Luas alas = &nbsp;𝞹 x 7²</p><p>&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; = <u>154 cm</u>^<u>2</u></p><p>Luas selimut = Keliling alas x tinggi tabung</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= (2 x 22/7 x 7) x 14</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 44 x 14</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= <u>616 cm</u>^<u>2</u></p><p>&nbsp;</p><p>Jadi, total luas permukaan tabung = (154 x 2) + 616 = <strong><u>824 cm</u>^<u>2</u></strong></p><p>&nbsp;</p><p>b). Volume bola</p><p>Rumus volume bola = 4/3 x 𝞹 x r³</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 4/3 x 22/7 x 7 x 7 x 7</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 4/3 x 22 x 49</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 4/3 x 1078</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = <strong><u>808,5 cm</u>^<u>3</u></strong></p><p>&nbsp;</p><p>Sekian penjelasan, maaf jika ada yang salah.</p>