To determine which statements are true for rectangles, we need to analyze each given statement based on the properties of rectangles:
- A. All interior angles are right angles.
This statement is true because a rectangle is defined as a quadrilateral with all interior angles being 90 degrees. - B. Diagonals are perpendicular to each other.
This statement is false for rectangles. In a rectangle, the diagonals bisect each other but are not necessarily perpendicular. Perpendicular diagonals are a property of rhombuses. - C. Diagonals are equal.
This statement is true. In a rectangle, the diagonals are congruent (equal in length). - D. Opposite angles are supplementary.
This statement is true. Since all angles in a rectangle are right angles (90 degrees), each pair of opposite angles sums to 180 degrees, fulfilling the property of being supplementary.
Therefore, the correct answer is: A, C and D only.