Angle whose measurement is** exact 90 degree** is **right angle**.

The keyword here is exact 90 degree.

It it gets more than 90, the angle will becomes obtuse.

If it gets less than 90, the angle becomes acute.

Examples of Right Angle is given below:

**Right Angle & Its Part**

Right Angle is formed by joining two rays at a common point at exactly 90 degree angle.

Some important parts of Right Angle is:

**(a) Arms**

The two rays joining to form the angle is known as Arms.

Here OA & OB are the two arms of the angle

**(b) Vertex**

The common point at which the two ray join is called Vertex.

Here Point O is the vertex

**Drawing Right Angle using Protractor**

In order to draw a right angle you need a device called Protractor.

Protractor can be easily purchased from the local stationary shop and its very cheap to buy.

Do the following steps for angle construction:

**(a)** Take a blank paper and draw a horizontal line OA

**(b)** Take protractor and place its center at point O (as given in figure)

**(c)** To make right angle you have to measure exact 90 degrees.

Find the 90 number in protractor and mark Point B

**(d)** Remove the protractor and join line OB

Thus we got Angle AOB = 90 degree

**Right Angle in Geometrical Figure**

Some common geometrical figures that form 90 degree angle are:

**(a) Square**

All the angles are exactly 90 degrees

**(b) Right angled triangle**

Here one angle is 90 degree

**(c) Pentagon**

Angle C & D are the two right angles

**(d) Quadrilateral**

Angle A & D are 90 degree angles

**Right Angle – Practical Example**

**(A) **Bread Slice making 90 degree angle

**(B)** 3 o’ clock making 90 degree angle

**(C)** Basketball Court

Each corner is making 90 degree angle