I believe it should be A.
Unsure what you mean by diagonal right triangle
but if you wanted to find the hypothenuse (longest side) of a right triangle, you can apply pythagorean theorem

where c is the hypothenuse
a and b are the other sides
F = 41
E = 90
D = 49
from D to E is 55
then E to F also known as X = 36.08 or 41.51
0.0006 would be your answer based on the order you put them in.
Answer:
.0000111
Step-by-step explanation:
move the decimal five places to the left because the 5 is negative