Answer:
BC = 9 miles
Explanation:
Here, we are given ΔABC ∼ ΔEDC, which means both triangles are similar and they tend to have the same dimensions and properties.
To find the length of BC, we are given the proportion:
![(12)/(8) = (x)/(6)](https://img.qammunity.org/2021/formulas/mathematics/college/f9mtz5ju4cha3wdo9hy6wqtqkhgiv9twi1.png)
Where x represents the length BC.
Solving further, let's cross multiply
![12 * 6 = 8x](https://img.qammunity.org/2021/formulas/mathematics/college/av9ulmg3su1951lmh4ackfhqeyccy72qe1.png)
![72 = 8x](https://img.qammunity.org/2021/formulas/mathematics/college/39mr1yk39l569ksoypqnaz5k3vhwr0grwb.png)
Solving for x, we have:
![8x = 72](https://img.qammunity.org/2021/formulas/mathematics/middle-school/cp460bmmf0ysie2kbavjtxkhz3ts7ekmcm.png)
Lets divide both sides by 8
![(8x)/(8) = (72)/(8)](https://img.qammunity.org/2021/formulas/mathematics/college/g81j0glnz0gyhw1oisfcu6z6olajll5psk.png)
![x = 9](https://img.qammunity.org/2021/formulas/mathematics/high-school/1z5wn7xt3xwszwug4q2n18sz851or739mc.png)
Therefore the distance BC is 9 miles