Final answer:
When a rectangle is inscribed in a circle, the diagonals of the rectangle are equal to the diameters of the circle.
Step-by-step explanation:
When a rectangle is inscribed in a circle, the diagonals of the rectangle become the diameters of the circle.
This means that the length of the vertical diagonal of the rectangle is equal to the diameter of the circle, and the length of the horizontal diagonal is also equal to the diameter of the circle.
For example, if the rectangle has sides of length 8 units and 6 units, the length of the vertical diagonal is 10 units (which is the diameter of the circle) and the length of the horizontal diagonal is also 10 units (which is the diameter of the circle).
Therefore, when a rectangle is inscribed in a circle, the diagonals of the rectangle are equal to the diameters of the circle.