The right angles can be seen at many places in a classroom. The corners of the class room form right angle. The edge of a corner and the base of the wall forms a 90 degree angle.
The blackboard in the class is rectangular shaped. The four corners of the blackboard forms right angles.
The deks and benches in the classroom also have right angles. The length side and the side the breadth side of the desks and benches are inclined at right angles to each other.
The duster, which is in the shape of a rectangle also have right angle. The eraser, which is in the shape of a rectangular prism, forms right angles. The adjacent edges of the eraser are at right angles to each other. The right angles can be seen in the doors and windows in the classroom.