Two joining rays make an angle. The common allude where these 2 rays satisfy is referred to as the vertex and also the rays are referred to as arms of the angle.

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The meacertain of an angle is the amount of turn or rotation of a point from one arm to another alengthy its vertex.


When the arms of the angle lie in the oppowebsite direction, they develop a straight angle. The angles make a directly line via the vertex.

A straight angle is likewise dubbed ‘level angle’.


In the picture, OX and OY are the arms of an angle. The widespread allude O wbelow the rays satisfy is called the vertex.

How to recurrent a straight angle?

Tright here are miscellaneous methods to reexisting right angles as per the measurement device.

It is written as 180°

It is also composed as π

All angles provided in the photo are directly angles.


Properties of a straight angle

A directly angle is formed by rotating one ray by 180°through respect to one more ray.


In a right angle, the angle rays face in the oppowebsite directions.

A directly angle reverses the direction of a point

A directly angle is exactly half of a transformation.

A right angle deserve to additionally be formed by adding 2 best angles.

Drawing a directly angle using a protractor

Draw a straight-line OA, with an arrowhead at A.

Now save the protractor on this line such that the baseline of the protractor is aligned over OA. The A need to be pointing towards the 0°of the protractor.

Start from 0° and also move in the direction of 180° noting of the protractor. On getting here at 180°, mark a allude B on the paper.

Join the vertex of the line OA with the allude B. the second ray OB will certainly have actually the arrowhead at B.


Straight angles in genuine life

The inclined plane of a staircase represents a straight angle.

The directly angle of a see-witnessed.

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Fun Facts

Straight angles look choose a right line, but it has actually 2 arms. On the other hand, a straight line has just one arm that points in one direction.