ini juga kak butuh bantuannyaa 🙏🏻

<p>pk = 50 cm</p><p>lk = 40 cm</p><p>pf = 50 - (5 + 5) = 40 cm</p><p>lf = 40 - 3 - a = (37 - a) cm</p><p>&nbsp;</p><p>a. pk/pf = lk/lf</p><p>&nbsp; &nbsp; &nbsp;50/40 = 40/ (37-a)</p><p>&nbsp; &nbsp; &nbsp;5/4 = 40/(37 - a)</p><p>&nbsp; &nbsp; 5(37 - a) = 160</p><p>&nbsp; &nbsp; 185 - 5a = 160</p><p>&nbsp; &nbsp; 185 - 160 = 5a</p><p>&nbsp; &nbsp; 25 = 5a</p><p>&nbsp; &nbsp; a = 5 cm</p><p>&nbsp; &nbsp; Lebar karton dibawah foto adalah 5 cm</p><p>&nbsp;</p><p>b. L. foto : L. Karton = (pf x lf) : (pk x lk)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= (40 x 32) : (50 x 40)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 1.280 : 2000</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 16 : 25</p><p>&nbsp; &nbsp; Perbandingan luas foto dan luas karton adalah 16 : 25</p>