Question

The two triangles are similar, What is the length of DE?

Answer 1

Answer:

This is easy. All you need to do is set up a proportional relationship.

A proportional relationship uses variables to show similarities, in this case, in triangles.

$\frac{2}{3} = \frac{x}{6.3}\\\\3x = 12.6\\\\x = 4.2$

x represents the missing side.