In today’s post, us will discover what a straight angle is, how many degrees it has, and also its properties. Us will also practice with some examples.

You are watching: What is the measure of a straight angle

What is a straight Angle?

An angle is a section of the airplane between 2 rays that room joined by a vertex.

A straight angle is the shared room between 2 rays join by a peak measuring 180º.


We can also think of an angle as the amplitude the a line’s rotation end a point. As such a directly angle has actually the amplitude the 180º of a beam over a point.

How many Degrees does a directly Angle Have?

A directly angle actions 180 degrees (180º). The amplitude of an angle deserve to be measured through a protractor.

The most common protractors have actually an amplitude that 180º, in various other words, a straight angle.

How to measure up an Angle

To refresh her memory around how the amplitude of an edge is measured with a protractor, take it a look at the following video clip of an interaction tutorial. The briefly defines the different species of angles, including a directly angle.

When is an angle Straight?

An edge is straight as soon as the two rays that comprise the angle space in the same place on opposite sides of a point. That is, they kind the shape of a line.


A directly angle is when a ray provides a half rotation around a point. This way, it ends in the same position yet pointing the opposite way. In other words, if you are standing looking in ~ a door and turn 180º, the door will finish up behind you. That’s why we say a human ‘has excellent a 180’ when they have completely changed their mind. For example, if someday a girlfriend tells united state that cats room their favourite animal and another work they don’t choose them at every we deserve to say the they have actually done a 180.

Properties of right Angles

Measures specifically 180º.Forms a line.A 180º turn always ends in the opposite direction.It is the boundary between convex (acute, right, and also obtuse angles) and concave angles.It is the amount of two right angles.It is half of a finish angle.If we look at the angles within a circumference, the would separate the circle into two same halves and also correspond to the diameter of the circumference.When the amount of an acute angle and an obtuse angle is same to a right angle, those angle are thought about supplementary.

Additionally, in various other blog posts, you deserve to learn an ext about angles and the different types.

Straight angles Examples

We find examples of together angles generally in our everyday lives.

You can uncover it as soon as you read the hours on one analog clock. In ~ what times execute the clock hands type a directly angle?


When girlfriend stretch your arms or a dancer stretches your legs you deserve to see these type of angles.


These are just some examples, have the right to you think the more?



Look at this exercises around this form of angle and think around how to settle them. Friend will discover the solutions at the end of this section.

See more: This Is How Long Will Cooked Salmon Last In The Fridge, How Long Does Cooked Salmon Last In The Fridge





Yes, that is. If girlfriend look carefully the practice itself is providing you examples of angle that are straight and also those that space not.It is no a directly angle. The angle that appears is acute and convex.It is an angle that measures 180º.

If you would like access to genuine interactive exercises, register with, the online learning technique for kids ages 4 come 14 to learn math, and get started today!