1. The walls make right angles with the floor they meet.

2. Your books and notebooks have rectangular surfaces. Hence the adjacent sides of a book make a right angle.

Indeed where ever you see a rectangular surface, you can identify a right angle there.

3. The four angles formed in The Holy Cross are right angles.

4. Right triangle models many real life situations and the problems are solved using either Pythagorean theorem or trigonometric ratios.

**For example,** an object erected vertically like a building makes a right angle with the horizontal. The North - South line are at right angles to the West - East line.

5. The coordinate axes, X and Y axes are perpendicular to each other. Thus the two axes form four right angles in the four quadrants as shown below.

6. Boomerangs are flight toys that return to the thrower after moving a distance in the air.

The angle between the wings vary from 70º to 140º. But in traditionally designed Boomerangs the angle between the wings is fixed as a right angle. In general a right angle can be observed whenever two intersecting sides, arms or surfaces are perpendicular to each other.