Common Core Math Vocabulary

Right Angle - Definition with Examples

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: ˚)

angle
 
 
 

Some common types of angles are acute angles, right angles, and obtuse angles.

types of 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 ∟.

right angle
 

The given image shows various formations of the right angle.

formations of the right angle
 

We can find the right angles in shapes.

A square or rectangle has four corners with right angles.  

right angle in shapes
 

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.

right angles around us
 

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.

diagonal intersection at 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.

horizontal line

2. Now place the protractor on the horizontal line.

protractor on horizontal line

3. Measure 90˚ and mark it with a point.

measure on protractor

4. Now using a scale, draw a straight line from this point to the horizontal line.

 draw straight line on the horizontal line
 

  Fun Facts

  •  All right angles are the same.

  • All right angles correspond to quarter of a complete turn.

  •  All triangles with one angle right are called right-angled triangles.

 

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