No, some of the geometrical answers are wrong.
Yes, all of the radii in a single circle are congruent.
All right triangles inscribed in a circle have their vertices on the circle and the hypotenuse as the circle's diameter. Thus the midpoint of the hypotenuse is the center of the circle nd all points on the circle are eqully as far from the center even so the vertex of the right angle.
Yes. The corners must be right angles for it to be inscribed on the circle.
Yes, providing that the radii are all in the same circle
Yes. It follows from one of the circle theorems which states that the angle subtended in a semicircle is a right angle.
Yes providing that they are in the same circle
Yes, providing it is the same circle.
Yes, it is.
In a circle no, in a square yes.
Yes
Yes
yes. the leg of the triangle has to be formed different because of the circle