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The triangles in the figure are similar. What is the length of CD?

I know the answer is 21 but idk why can someone explain? ​

The triangles in the figure are similar What is the length of CDI know the answer is 21 but idk why can someone explain class=

Respuesta :

Answer:

In steps

Step-by-step explanation:

ΔABE ~ ΔACD

AB / AC = BE / CD

3 / 9 = 7 / CD

CD = (9 x 7) / 3 = 63 / 3 = 21

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