The missing length in the triangle is 6 units
Note that:
The two triangles are symmetrical
Let the missing words be x
For two symmetrical shapes, the ratios of the corresponding lengths are equal
[tex]\frac{8}{4} =\frac{8+x}{7} \\\\2=\frac{8+x}{7}[/tex]
Cross multiply
2(7) = 8 + x
14 = 8 + x
Subtract 8 from both sides
14 - 8 = 8 + x - 8
x = 6
Learn more on similar triangles here: https://brainly.com/question/14285697
