1. The problem asks which figures have perpendicular sides. 2. Perpendicular sides meet at a right angle (90 degrees). 3. Shape A is a trapezoid with two right angles marked, so it has perpendicular sides. 4. Shape B is a rectangle with four right angles, so it definitely has perpendicular sides. 5. Shape C is a parallelogram with no right angles marked, so it does not have perpendicular sides. 6. Shape D is a trapezoid with no right angles marked, so it does not have perpendicular sides. 7. Therefore, the figures with perpendicular sides are A and B only. Final answer: ⓐ A and B only