Final answer:
To find the acute angle between the diagonals of a rectangle inclined at 25°, subtract that angle from 90°.
Step-by-step explanation:
To find the acute angle between the diagonals of a rectangle, we need to determine the measure of one of the acute angles formed by the diagonals. Since the given diagonal is inclined at 25° to one side of the rectangle, we can subtract this angle from 90° (since the sum of angles in a rectangle is 90°) to find the acute angle between the diagonals. So, the acute angle between the diagonals is 90° - 25° = 65°. Therefore, the correct answer is option a. 65°.