Respuesta :
Answer:
Think 139 in
Step-by-step explanation: You multiply all the numbers together then square root your final answer
The length of the diagonal [tex]x[/tex] created by the smaller bookend is 7.2 inches.
How to apply triangle similarity
In this question we have two pairs of books which create two similar triangles, whose formula is an application of the concept of direct proportionality:
[tex]\frac{12\,in}{10\,in} = \frac{x}{6\,in}[/tex] (1)
[tex]x = 7.2\,in[/tex]
The length of the diagonal [tex]x[/tex] created by the smaller bookend is 7.2 inches. [tex]\blacksquare[/tex]
Remark
The figure associated to the question is missing. We included a simplified representation of the figure below.
To learn more on similar triangles, we kindly invite to check this verified question: https://brainly.com/question/25882965