A right angle actions 180° and looks prefer a straight line, therefore, that is a mathematical means of expressing a straight line. The is an edge whose arms lie in opposite direction from the vertex and also they sign up with together to kind 180°. Let united state learn an ext about the directly angle in this article.

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1.Straight edge Definition
2. Properties of a directly Angle
3.Straight angle Degree
4.Drawing a directly Angle making use of a Protractor
5.FAQs on directly Angles

Whenever two rays sign up with together they type an angle and the edge subtended by 2 rays in opposite directions is called a straight angle. In geometry, a straight angle is an angle whose vertex suggest has a value of 180 degrees.

In various other words, when the arms of the edge lie in the contrary direction, they form a straight angle. The arms make a right line through the vertex.


The vital properties of straight angles are as follows.A right angle is formed by rotating one beam by 180° v respect to another ray.A right angle reverses the direction of a point.A directly angle is exactly fifty percent of a revolution.

The degree or the measure of a right angle is always 180º. In the standard angle measure system, we think about the right angle as 90º and also the angle approximately a allude to it is in 360º. The directly angle is comprised of two ideal angles. Observe the number given listed below to recognize this fact.


A directly angle deserve to be created easily making use of a protractor. Monitor the steps given below to draw a straight angle making use of a protractor:

Step 1: Draw a directly line and also name the as ab and note an arrowhead ~ above B.Step 2: place the protractor ~ above line abdominal such that the baseline the the protractor is over the line AB. Ensure that B is pointing come 0°.Step 3: starting from 0° in the inner scale and keeping the protractor solved on the place, relocate your pencil slowly until you with 180°. Note this allude as C and likewise mark an arrowhead here.Step 4: Join allude C with line AB. Thus, a right angle CAB the 180º is formed.

The following figure shows how a directly angle is constructed using these steps.

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Straight edge Pair

A pair of angles that type a straight line is dubbed a directly angle pair. The amount of 2 angles that room in a straight angle pair is constantly equal come 180°. Lock are likewise known as linear pairs the angles. The photo shown below shows two angles a = 135° and b = 45°, which together form 180°. The straight angle pairs have actually the complying with properties in common. They have actually a typical arm and also a common vertex. In the complying with figure, QS is the usual arm and also Q is the common vertex.

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Straight angle in real Life

We come across straight angles often in our day-to-day life. Some instances of a directly angle are provided below.

The clock mirroring 6 o'clock develops a right angle.A rectangle-shaped tabletop represents a directly angle.Your line of sight is the perfect instance of a directly angle.

All the angles given listed below are straight angles. They differ just in orientation. Complying with these, we can find plenty of straight angles roughly us.

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Topics regarded Straight Angles

Important Notes:

A straight angle is developed by rotating one ray by 180° v respect to an additional ray.A directly angle is exactly half of a revolution.In radians, the straight angle is denoted by π.A directly angle reverses the direction of a point.A straight angle is additionally called a ‘flat angle’.A directly angle pair is a collection of two nearby angles top top a straight line that add up come 180°If ∠A + ∠B = 180°, climate ∠A and ∠B type a directly angle pair (linear pair).