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Yes, if all points lie on the circle then the hypotenuse of the right triangle has to be the diameter of the circle.
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I know if the triangle has 1 side as a circle's diameter, and a 90 degrees, then i can use thale's theorem. but i'm wondering if the opposite also work
—> Yes if one angle is 90 degrees, it has to be the diameter of the circle.

if i know a triangle inside a circle is 90%, does that mean 1 of it's sides is the diameter?
—> Yes always

also wondering, if a triangle has it's sides ratio as 3,4,5, or 5,12,13, does that mean the triangle is 90 degrees?
—> Yes, Both the sets (3,4,5) and (5,12,13) satisfy the Pythagoras theorem

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