Ini gambarnya dan juga soal tolong dijawab ya besok dikumpul

1.cari perbandingannya dulu
[tex] \frac{4}{4 + 3} = \frac{x}{4.2} = \frac{3.6}{y} [/tex]

[tex] \frac{4}{7} = \frac{x}{4.2} = 4 \times 4.2 \div 7 = x \\ 16.8 \div 7 = 2.4cm \: \: \: \: \: x = 2.4cm[/tex]

[tex] \frac{4}{7} = \frac{3.6}{3.6 + y} =4 \times (3.6 + y) = 7 \times 3.6 \\ = 14.4 + 4y = 25.2 \\ = 4y = 25.2 - 14.4 \\ = 4y = 10.8 \\ y = 10.8 \div 4 = 2.7cm[/tex]

2.rumus=
[tex]ef = \frac{ab \times ed + cd \times ae}{ad} \\ [/tex]
[tex]9.8 = \frac{ab \times 3 + 8 \times 7}{10} \\ 98 = 3ab + 56 \\ 98 - 42 = 3ab \\ 42 = 3ab \\ ab = 14[/tex]
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