Final answer:
In a rhombus, opposite angles are congruent, so (mangle GHI) is equivalent to (mangle HIJ).
Step-by-step explanation:
A rhombus is a quadrilateral with all sides of equal length. In a rhombus, opposite angles are congruent. So, in quadrilateral HIJ, where HIJ is a rhombus, angles GHI and HIJ are congruent. Therefore, (mangle GHI) is equivalent to (mangle HIJ).
Answer: (H)