What is the geometric mean of 7 and 13?

i got up to this step but i don't understand what it's telling me to do in the last step.

  √91 ≈ 9.5394

Step-by-step explanation:

Take the square root of 91 to find the value of x. There is no simpler radical form. You can write it as ...

  x = √91 . . . . . . . simplest radical form

or as

  x ≈ 9.5394 . . . . an approximation of the irrational root

im sorry but no. i just need to answer for 50 poonts oof

the 2 figures are congruent bc if you reflect abcd over the y axis then over the d axis the figures overlap