# Types of Angles – Acute, Right, Obtuse, Straight and Reflex

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## Types of Angles

### Acute angle:

#### An angle whose measure is less than 90 degrees. The following is an acute angle. ### Right angle:

#### An angle whose measure is 90 degrees. The following is a right angle. ### Obtuse angle:

#### An angle whose measure is bigger than 90 degrees but less than 180 degrees. Thus, it is between 90 degrees and 180 degrees. The following is an obtuse angle. ### Straight angle

#### An angle whose measure is 180 degrees.Thus, a straight angle look like a straight line. The following is a straight angle. ### Reflex angle:

#### An angle whose measure is bigger than 180 degrees but less than 360 degrees.The following is a reflex angle. #### Angle with a common vertex and one common side. <1 and <2, are adjacent angles. ### Complementary angles:

#### Note that angle 1 and angle 2 do not have to be adjacent to be complementary as long as they add up to 90 degrees ### Supplementary angles:

#### Two angles whose measures add to 180 degrees. The following are supplementary angles. ### Vertical angles:

#### Angles that have a common vertex and whose sides are formed by the same lines. The following(angle 1 and angle 2) are vertical angles. #### When two parallel lines are crossed by a third line(Transversal), 8 angles are formed. Take a look at the following figure ### Corresponding angles:

#### Here we go! Study the types of angles carefully. This is where any serious study of geometry begin.

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