Question

select all the rectangles.

Explanation:

Step1: Recall rectangle definition

A rectangle is a quadrilateral with four right angles (90° angles) and opposite sides equal and parallel.

Step2: Analyze each figure

• Red figure: Has four right angles (marked by the square corners) and opposite sides appear equal/parallel. So it's a rectangle.
• Blue figure: A parallelogram, but no right angles (sides are slanted, angles not 90°). Not a rectangle.
• Green figure: A parallelogram, slanted, no right angles. Not a rectangle.
• Yellow figure: A parallelogram, slanted, no right angles. Not a rectangle.

Answer:

The red - outlined figure (the first one in the top - left) is the rectangle. If we consider the checkmarks in the original, but based on the definition, only the red figure with four right angles is a rectangle. (If the original's checkmarks were incorrect, the correct one is the red - boxed figure with four right angles.)