What makes a rectangle a rectangle? This 3rd grade rectangle properties worksheet answers that question with a short rule box. It lists three properties. All four angles are right angles, opposite sides are equal, and there are two pairs of parallel sides. Below the box, four shapes are labelled a to d, with their side lengths in feet, metres, centimetres and inches. Next to each shape, your child answers the same three questions. Then they decide whether the shape passes all three tests. The page sits on light grid paper, so the square corners are easy to spot. Page two is the answer key, and it ends each item with a short sentence that gives the verdict.