Answer:
the rationalnumbers are A, F, B, D,
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The pattern is if you write the alphabet backwards it is always going to be cross off two letters then skip a letter then cross off the letter after the letter that you skipped then skip two then cross off two letters
In the figure we have three right angles .The triangles similar to each other .Similar triangles have sides in proportion .The altitude rule is true for the triangles .
The theorem states :The altitude to the hypotenuse of a right triangle is the mean proportional between the segments into which it divides the hypotenuse.
Substituting the values from the triangles we ahve:
s is the right answer