Jika AD : DC = 1:2 panjang AB adalah...

Jika AD : DC = 1:2 panjang AB adalah…

AC : DC = 3:2
3/2*12 cm = 18 cm

$frac{ad}{dc} = frac{1}{2} \ maka \ frac{ac}{dc} = frac{3}{2} \ \ frac{ac}{dc} = frac{ab}{de} \ frac{3}{2} = frac{ab}{12} \ ab = frac{12 times 3}{2} \ ab = 6 times 3 \ ab = 18 : cm$