Respuesta :

Umbreon33

Answer:

6 inches

Step-by-step explanation:

∆ABD and ∆ACD are exactly the same, only back-to-back

So the base of both triangles are 3 inches

3 + 3 = 6

Thus, the length of line BC is 6 inches

m∠1 = 90°

/_ CAD = 45°