The equation used to find the missing lengths:
9 = __SR (5^2 + x^2)__
As long as it is a right triangle, this is called the Pythagorean Theorem

** FYI- if you wanted to SOLVE FOR THE MISSING SIDE X, then just switch around the original equation solving in terms of x:

Answer:
shouldn't it be all the same answer since it looks like a equilateral triangle
Answer: if ur trying to do the equation for coordinate planes its
Y2-y1.
X1-x2
Step-by-step explanation:
That's what i was taught I'm in 8th grade tho so