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Different Angles have different names:

An Obtuse Angle is more than 90° but less than 180°

All the angles below are obtuse angles:

Which Angle?

Remember to look carefully at which angle you are being asked to name.

The obtuse angle is the smaller angle.
It is more than 90° and less than 180°.

The smaller angle is an Obtuse Angle,
but the larger angle is a Reflex Angle

If you choose the larger angle you have a Reflex Angle (more than 180° but less than 360°) instead:

1782, 3282, 9153, 9154, 1781, 3286, 3287, 8985, 809, 810

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Definition

An angle is the space that forms in the corner whenever two line segments meet.

The small curved line in the corner is a standard notation that represents an angle. Here is another angle:

Although the two examples are clearly quite different, they're both still angles by definition because they show the space that forms when two line segments meet.

Right Angles

To talk about obtuse angles, it'll help us to define right angles. A right angle is one that measures exactly 90 degrees. A right angle is easy to spot because it forms a perfect square.

These are common angles because there are many times when people are building something and want a square corner. Imagine the rooms of your home, your doors or table corners without right angles!

Obtuse Angles

Obtuse angles are simply angles larger than 90 degrees. We can spot them because they extend past what would be a right angle.

Imagine tilting a car seat back so that you can lie down comfortably. You'd push it past the upright position, closer to lying flat. Where the seat's bottom and back meet would be an obtuse angle because you've pushed the back beyond a 90 degree angle. It might look something like this:

The dashed line indicates a right angle. The seat's back is clearly pushed beyond that point, forming an obtuse angle.

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what is an obtuse angle? - definition & examples - video & lesson transcript | study.com

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What is an Obtuse Angle? - Definition & Examples - Video & Lesson Transcript | Study.com

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An angle is the space that forms in the corner whenever two line segments meet. The small curved line in the corner is a standard notation that represents an angle. Here is another angle: Although the two examples are clearly quite different, they're both still angles by definition because they show the space that forms when two line segments meet.

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Types of Angles Right Angles Obtuse Angles Straight Angle Reflex Angles Angles On a Straight Line Angles Around a Point Degrees (Angle) Geometry Index

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Right angles in shapes (informal definition)

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In this lesson, we will learn what are right angles... www.mathexpression.com

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Angles Song | Acute, Obtuse, & Right Angles | 3rd & 4th Grade

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What is an Acute Angle?

An acute angle is any angle smaller than a right angle. A right angle is an angle that measures 90 degrees. A right angle forms part of a square, which is why it's often depicted by a square at the angle:

So an acute angle is always smaller than the shown angle. Here's an example:

The thin blue line indicates where a right angle would be. The angle in black is much smaller than the right angle, so it's clearly acute. It doesn't matter how much smaller an angle is than 90 degrees. Even if an angle measures 89.99999 degrees, it's still acute because it's smaller than 90 degrees.

Consider the following example:

This angle is much closer to 90 degrees, but it's still smaller, so it's an acute angle.

More Acute Angles

There are several real-world examples of acute angles. A typical pizza slice forms an acute angle:

The angle at the slice's tip is smaller than 90 degrees, making it an acute angle. Kitchen tongs also open at an acute angle:

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description & examples - video & lesson transcript | study.com

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What is an Acute Angle? - Definition, Description & Examples - Video & Lesson Transcript | Study.com

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An acute angle is any angle smaller than a right angle. A right angle is an angle that measures 90 degrees. A right angle forms part of a square, which is why it's often depicted by a square at the angle: So an acute angle is always smaller than the shown angle.

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The definition of Straight Angle: A straight angle changes the direction to point the opposite way. It looks like...

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What Is a Straight Angle?

A straight angle is just a mathematical way of saying a straight line. Basically, it's a perfectly straight line with no bending or even the slightest change in angle. In mathematical terms, it is a line with no changes in angle. Any line will do: the sides of a bookshelf, the surface of a floor or ceiling. Even an imaginary line along your own line of sight would be considered a straight angle. A straight angle doesn't need to have endpoints to be a straight line. It can, such as the sides of a bookshelf. However, a straight line can also be a ray extending to one or both sides.

Line of Sight

Your line of sight is basically the imaginary line between your eye and whatever you are looking at. It might seem strange, but your line of sight is probably the best example of a straight angle because it cannot be deviated by gravity, the influence of a tool, or anything else. It must be exactly straight because that is how we see things.

How Does a Straight Angle Fit In?

In mathematics, there are several kinds of angles. Acute angles are smaller than 90 degrees, whereas those greater than 90 degrees but less than 180 are considered obtuse. Those greater than 180 degrees are called reflex angles. There are also more important, specific angles that have special names. For example, the right angle is exactly 90 degrees. It's important because it makes much of trigonometry possible such as sine, cosine, and tangent that comes with it. The Pythagorean Theorem comes into play with a right triangle as well.

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what is a straight angle? - definition & example - video & lesson transcript | study.com

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What is a Straight Angle? - Definition & Example - Video & Lesson Transcript | Study.com

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A straight angle is just a mathematical way of saying a straight line. Basically, it's a perfectly straight line with no bending or even the slightest change in angle. In mathematical terms, it is a line with no changes in angle. Any line will do: the sides of a bookshelf, the surface of a floor or ceiling.