perbandingan panjang AB:BC=2:3,jika panjang BC=15 cm,tentukan panjang AB

AB : BC = 2 : 3
BC = 15 cm

Ditanya AB

jawaban :

[tex] \frac{AB}{ BC} = \frac{2}{3} \\ \frac{AB}{15} = \frac{2}{3} \\ 3 \times AB = 15 \times 2 \\ 3 \times AB = 30 \\ AB = \frac{30}{3} \\ AB = 10 \: cm[/tex]

2/3 = AB/15 cm
AB = 2×15/3
= 30/3
= 10 cm