Consider a rectangle inscribed in a circle. What conclusion(s) can you reach about the relationship between the diagonals of the rectangle and the circle?

Answer:
The diagonals are simply the diameter of the circle!
Step-by-step explanation:
So the intersecting points on the diagonals are the centre of the rectangle, in the same way the diagonals start form a point of the circle's circumference and end in another point in its circumference which makes them a chord of the circle!
Moreover the 2 diagonals of the rectangle acting as 2 individual chords of the circle appear to meet at a point which is the centre of the circle as well as the centre of the rectangle!
Therefore the diagonals are simply the diameter of the circle or diagonal=2×radius of the circle!