1-7 Classifying Angles

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ANGLES: 

A N G L E S

Slide 2: 

You will learn to classify angles as acute , obtuse , right , or straight .

What is an angle?: 

What is an angle? Two rays that share the same endpoint form an angle . The point where the rays intersect is called the vertex of the angle. The two rays are called the sides of the angle.

Slide 4: 

Here are some examples of angles .

Slide 5: 

We can identify an angle by using a point on each ray and the vertex . The angle below may be identified as angle ABC or as angle CBA; you may also see this written as ABC or as CBA. The vertex point is always in the middle.

Angle Measurements: 

Angle Measurements We measure the size of an angle using degrees . Here are some examples of angles and their degree measurements.

Acute Angles: 

Acute Angles An acute angle is an angle measuring between 0 and 90 degrees. The following angles are all acute angles.

Obtuse Angles: 

Obtuse Angles An obtuse angle is an angle measuring between 90 and 180 degrees. The following angles are all obtuse.

Right Angles: 

Right Angles A right angle is an angle measuring 90 degrees. The following angles are both right angles.

Straight Angle: 

Straight Angle A straight angle is 180 degrees.

GAME TIME!: 

GAME TIME! The object of the game is to be the first to raise your hand and correctly name what type of angle you see . The correct answer will be on the following slide!! Good luck!

Acute Angle: 

Acute Angle

Obtuse Angle: 

Obtuse Angle

Right Angle: 

Right Angle

Straight Angle: 

Straight Angle

GREAT JOB!!: 

GREAT JOB!!