What is Right-Angle?
In geometry, when two rays meet each at a common point, they form an angle. The point of meeting of two rays is known as the vertex.
Angles are measured in degrees (symbol: ˚)
Some common types of angles are acute angles, right angles, and obtuse angles.
Right angle
When two straight lines intersect each other at 90˚ or are perpendicular to each other at the intersection, they form the right angle. A right angle is represented by the symbol ∟.
The given image shows various formations of the right angle.
We can find the right angles in shapes.
A square or rectangle has four corners with right angles.
Examples of right angles are all around us. We can see right angles in the corners of a room, book, cube, windows and at several other places.
A vertical and a horizontal line make most common right angles. However, diagonal lines intersecting each other also form right angles. If you draw the diagonals of a square, a rhombus or a kite, the angle at the intersection is 90 degrees and is, therefore, a right angle.
Example of a rhombus and a kite with diagonals intersecting at a right angle.
How to draw a right angle using a protractor?
1. Start by drawing a horizontal line.
2. Now place the protractor on the horizontal line.
3. Measure 90˚ and mark it with a point.
4. Now using a scale, draw a straight line from this point to the horizontal line.
| Fun Facts 1. All right angles are the same. 2. All right angles correspond to quarter of a complete turn. 3. All triangles with one angle right are called right-angled triangles. |
