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# The Basic Types of Angles

What is an angle? You can hear this work in your everyday life quite often, but take into account that it has quite an important meaning when it comes to mathematics. When studying this subject, you must become familiar with its different types or classifications, which are determined by measures. The good news is that you can use an easy-to-follow guide to get a better idea of existing types of angles.

• The measure of this angle is less than ninety degrees.
• Its measure is 90 degrees.
• Its measure is bigger than ninety degrees, but it must be less than 180 degrees, so it’s somewhere between 90-180 degrees.
• It’s the angle that is measured as 180 degrees, and this means that it looks just like a straight line.
• Its measure is not only bigger than 180 degrees, but it’s also less than 360 degrees.
• It’s an angle with 1 common side and a common vertex.
• It’s all about 2 angles with measures that add to ninety degrees, but you should note that they don’t need to be adjacent as long as this rule is followed.
• 2 angles with measures that add to 180 degrees.
• Angles with a common vertex, but their sides must be formed by the same lines.
• Alternate interior. These types of angles are all about the pair of interior angles on the opposite transversal sides.
• Alternate exterior angles are the pair of exterior angles on the opposite sides of a transversal.
• They are the pairs of the angles similar in positions.

## The Origins of Types of Angles

When it comes to planar geometry, an angle is a simple figure that is formed by 2 rays (called its sides), but they need to share a common endpoint (vertex). Remember that the angles formed by 2 rays must lie in a place, but it doesn’t need to be Euclidian. Besides, they are formed by any intersection of 2 places in different spaces (including Euclidian), and they are called dihedral (the types of angles ). Those angles that are formed by an intersection of 2 curves in planes can be defined as the ones determined by tangent rays. If you deal with spherical angles, you need to understand that they are formed by 2 great circles on a specific sphere, and it’s also possible to call them dihedral.

Nowadays, angles are often used to designate the measures of rotations, and it’s all about the length ratio of circular arcs to their radius. Are you interested in geometric angles? Then you should know that an arc must be centered at a vertex and delimited by sides. When learning everything about a rotation, keep in mind that an arc is centered at its center and delimited by any point.

If your teachers ask you to study the types of angles, it’s necessary to know what this term means. This word comes from Latin (the word that means a corner), but there are similar meanings in Greek (ankylose or crooked) and even English (ankle). Don’t forget that Euclid determines a place angle as an inclination to each other of 2 lines that meet, but they don’t lie straight in terms of each other. If you prefer Proclus, learn that any angle should be either a quantity or quality, or their relation. It’s interesting that the first concept was widely used by Eudemus who defined an angle as a simple deviation from any straight line, and the second concept was used by Carpus of Antioch who defined it as a certain space or interval between intersecting lines, while Euclid chose the third one, despite that his definitions of different types of angles are quantitative.

## How to Identify Angles

When handling different mathematic expressions, students are familiar with specific Greek letters, such as α, β, γ, and others, which serve as variables that stand for the sizes of angles. If you see lower case Roman letters, including a, b, c, in your geometry homework, they are used for the same purpose, while the upper case ones are always used for polygons. For students learning a variety of geometric figures, it’s possible to identify angles by those labels that are attached to the points that define them, so use this knowledge for different types of angles.

## How to Calculate Angles Measures in Polygons

In geometry, all types of angles are a space between 2 line segments or rays that have the same vertex or endpoint. One of the most popular ways to measure any angles is degrees, and a full circle is 360 degrees. You need to know the shape of a particular polygon and its other angles to calculate the measure of a given angle. For right triangles, it’s required to know the measures of its 2 sides. There are certain steps that should be taken to complete this task successfully, such as the following:

First, you need to count the number of all sides in a given polygon and find the total measures of its angles. The good news is that there are common total measures for all types of angles, and they can be categorized as:

• Angles in triangles (3 sides) – 180 degrees.
• Angles in quadrilaterals (4 sides) – 360 degrees.
• Angles in pentagons (5 sides) – 540 degrees.
• Angles in hexagons (6 sides) – 720 degrees.
• Angles in octagons (8 sides) – 1080 degrees.

Another step that should be taken is to define whether a particular polygon is regular. You should realize that all regular polygons have sides of the same length and their angles must have the same measure. As an example, take a look at equilateral triangles and squares. When dealing with regular polygons, you need to divide the total measure of their angles by their number, regardless of the types of angles that they contain. This is how you will conclude that the measure of all angles in equilateral triangles in 60 degrees, while the measure of all angles in squares is 90 degrees. However, if your academic assignment is not about regular polygons, ensure that you know the measures of all other angles to be able to calculate the measure of unknown angles.

You also need to add the measures of all known angles together, and then subtract the figure you get from the total angle measure of a given polygon. It’s worth mentioning that most geometry problems associated with this nature work with quadrilaterals and triangles because of a fewer numbers involved, so take this into consideration if your dissertation introduction is devoted to the same subject. For instance, if 2 angles in a triangle are 60 and 80 degrees, you should add these numbers together to end up with 140 degrees. The next thing that should be done is subtracting this sum from the total angle measure of a given triangle. The best part is that some polygons offer specific cheats that help students figure out the right measure of unknown angles.

## Tips on Calculating Angle Measures in Right Triangles

To achieve this goal, start with assessing everything that you already know. For example, right triangles are called this way because one of their angles is right, so it’s easy to find the measure of an unknown angle if you are already aware of a few specific things, such as the measure of 3rd angle or the measure of two triangle sides (in this case, be prepared to use trigonometry, and this academic task is different from writing any psychology paper ).

Next, you need to define the right trigonometric function for its further use, and it’s all about a ratio between two sides of a specific triangle. All students know that there are 6 trigonometric functions, but 3 of them are used more often. If you have the length of a hypotenuse and the length of the side that is opposite to an unknown angle, feel free to use the sine function that divides the second one by the first one. If you know the length of a hypotenuse and the length of the side that is adjacent to a given angle, it’s advisable to use the cosine function that divides the second one by the first one. Finally, if you are aware of the lengths of adjacent and opposite sides, use the tangent function, which divides the second one by the first one.

There are other things that you should do to learn basic how to write a reaction paper tips on this subject. Be sure to find a ratio of both unknown sides and the angle that corresponds to a trig function ratio. Assuming that you’re using a sine to determine an angle measure, an unknown angle is called an inverse sine or an arcsine, and you can use two possible methods to find it. People had to turn to the printed table of specific values for cosines, sines, and tangents for angles (0-90 degrees) in the past. These days, you have calculators with a trig function capability so that this task is much easier for different types of angles.