# Angles: Type of angles based on degree measurement

#### Academic Questions in MathematicsPlease check out our Test Your Knowledge page to see all Questions and Answers Factorize 12a2 - 20a + 3 A. (6a - 1)(2a - 3) B. (6a - 1)(2a + 3) C. (6a + 1)(2a - 3) D. (6a + 1)(2a + 3) E. (-6a + 1)(2a - 3) F. (-6a + 1)(2a + 3) Simplify 10ab + 7ab A. 17ab2 B. 17a2b2 C. 3ab2 D. 3a2b2 E. 17ab F 3ab Which of the following is not a type of angle? A. Right angle B. Left Angle C. Acute Angle D. Complete Angle E. Straight Angle F. Reflex angle Two lines that can never meet each other are best considered as _____ lines. A. straight B. vertical C. horizontal D. parallel E. oblique F. perpendicular An angle at exactly 90o is a/an _____ angle. A. acute B. obtuse C. reflex D. right E. complete F. straight Slanted or tilted lines that will finally meet at some point but NOT at a right angle are referred to as _____. A. Oblique B. Curved C. Vertical D. Perpendicular E. Parallel F. Horizontal The two sides that forms an angle are referred to as the _____. A. Arms B. Vertexes C. Bays D. Zones E. Limbs F. Dune The point where the two sides of an angle meet is termed the _____. A. Arms B. Vertex C. Bays D. Zones E. Limbs F. Dune ### Classification of Angles:

Angles are generally considered as a part of geometry. It is formed at a place where two line intersects or meet each other; and is measured in degrees.

An angle is defined as a figure formed by two sides of a line (called rays) meeting at a common endpoint (called vertex).

Please the introduction to angles here

Angles are classified into various types based on the following criterias:

• Based on their degree measurement

• Based on their pairs (angle pairs)

• Based on their direction of rotation

### Types of angle based on degree measurement

Angles can be determined based on their measurement in degree. To this end, an angle with zero degree (0o) is called a zero angle; and it's formed when the arms of the angle are at the same position.

If we increased the size of the angle to a certain degree, the name of the angle changes automatically. For instance, an angle between 0o through 90o is termed an acute angle but as soon as we increase the size of the angle to 90o, its name changes to a right angle.

Generally, we are seven types of angles based on their degree measurement. The image below shows six of these: Below are explanations on the types of angle based on degree measurement:

1. Zero Angle: This is an angle that has a measurement of 0o. It is formed when both arms of the angle are at the same position. Below is an image that shows a zero angle. From the above image, the points P, Q and R are on the same position. As a result, the angle PQR equals zero degree (∠ RPQ = 0o)

2. Acute Angle: This is an angle whose degree measurement is greater than 0o but less than 90o. Instances of acute angles include 1o, 15o, 30o, 45o, 60o 89o, etc. The image below shows a 60o angle. 3. Right Angle: An angle that is exactly 90o is termed a right angle. For this reason, it's also called a 90o angle (90 degree angle). They are represented by drawing a small box between the vertical and horizontal arms of the angle. See the image below: 4. Obtuse Angle: An obtuse angle is always greater than 90o but less than 180o. Examples of obtuse angles are 91o, 110o, 130o, 150o, etc. It is shown in the image below: 5. Straight Angle: This is an angle that is exactly 180o. Straight angle may also be termed as an angle on a straight line. See the image below: 6. Reflex Angle: This is an angle whose degree measurement is greater than 180o but less than 360o. Angles that fall within this range includes 181o, 200o, 250o, 359o, etc. 7. Complete Angle: This is an angle whose measurement is exactly 360o. Complete angle are also known as full rotation angle:  Alfred Ajibola is a Medical Biochemist, a passionate Academician with over 7 years of experience, a Versatile Writer, a Web Developer, a Cisco Certified Network Associate and a Cisco CyberOps Associate.

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