Which statements are true about quadrilaterals? choose all answers that are correct. a. all 4-sided shapes are parallelograms. b. some rectangles are squares. c. all squares are rhombuses. d. some trapezoids are parallelograms.

A. False. Some 4 sided shapes could be figures such as trapezoids where only one pair of opposite sides are parallel.

B. True. Some rectangles are squares. Specifically when all four sides are the same length.

C. True. A square is a combination of a rhombus and a rectangle. If the figure is a square, then it is a rhombus and it is also a rectangle.

D. False. Trapezoids only have one pair of opposite parallel sides



In summary, the true statements are choice B and choice C