Geometry

Question Analysis:
This question checks properties of rectangles.
Main focus: diagonal and angle relationships.

Key Concept Explanation:
Rectangles always have equal diagonals and right angles, but not necessarily equal sides.

Step-by-Step Solution:
A) describes a square
B) true for squares or rhombuses, not all rectangles
C) correct—rectangle diagonals are always equal
D) describes a square,...