Here are the answers to your questions:
Question 1: A rhombus has right angles.
Answer: False
(Rhombuses have opposite angles that are equal and adjacent angles that are supplementary, but they do not necessarily have right angles unless it is specifically a square.)
Question 2: A square and a rectangle have four right angles.
Answer: True
(Both squares and rectangles have four right angles by definition.)
Question 3: A trapezoid is a parallelogram.
Answer: False
(A trapezoid has at least one pair of parallel sides, but it is not necessarily a parallelogram, which requires both pairs of opposite sides to be parallel.)
Question 4: Some parallelograms are squares.
Answer: True
(Squares are a specific type of parallelogram where all sides are equal and all angles are right angles.)
Question 5: In a rectangle, all sides are congruent.
Answer: False
(In a rectangle, opposite sides are congruent, but adjacent sides can be of different lengths.)
Feel free to ask if you have more questions!