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ANGLES
You will learn to classify
angles as acute,
obtuse, right, or
straight.
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.
• Here are some examples
of angles.
• 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
• We measure the size of an angle using
degrees.
• Here are some examples of angles and
their degree measurements.
Acute Angles
• An acute angle is an angle measuring
between 0 and 90 degrees.
• The following angles are all acute angles.
Obtuse Angles
• An obtuse angle is an angle measuring
between 90 and 180 degrees.
• The following angles are all obtuse.
Right Angles
• A right angle is an angle measuring 90
degrees.
• The following angles are both right angles.
Straight Angle
• A straight angle is 180 degrees.
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
Obtuse
Angle
Right
Angle
Straight
Angle
GREAT
JOB!!

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angles.pp.ppt

  • 2. You will learn to classify angles as acute, obtuse, right, or straight.
  • 3. 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.
  • 4. • Here are some examples of angles.
  • 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.
  • 6. Angle Measurements • We measure the size of an angle using degrees. • Here are some examples of angles and their degree measurements.
  • 7. Acute Angles • An acute angle is an angle measuring between 0 and 90 degrees. • The following angles are all acute angles.
  • 8. Obtuse Angles • An obtuse angle is an angle measuring between 90 and 180 degrees. • The following angles are all obtuse.
  • 9. Right Angles • A right angle is an angle measuring 90 degrees. • The following angles are both right angles.
  • 10. Straight Angle • A straight angle is 180 degrees.
  • 11. 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!
  • 12.
  • 14.
  • 16.
  • 18.