no 7 please besok di kumpul buat caranya

[tex] \frac{ef}{ab} \div \frac{de}{ae} [/tex]
[tex] \frac{9.8}{ab} \div \frac{3}{7} [/tex]
[tex]3ab = 68.6[/tex]
[tex]ab = \frac{68.6}{3} [/tex]
[tex]ab = 22.86[/tex]

[tex] \frac{1.8}{3} = \frac{x}{10} \\ 3 \times x= 1.8 \times 10 \\ 3x = 18 \\ x = \frac{18}{3} = 6[/tex]
Panjang AB = 8 + 6 = 14 cm