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angles.pp.ppt
- 1. ANGLES SOL 5.12 The studentwill classify and measure right, acute, obtuse, and straight angles. No not angels!!
- 2. You will learnto classify angles as acute, obtuse, right, or straight.
- 3. Extra Learning Goals Thisis an ambitious lesson but I think we can extend our learning to include… 1. Becoming familiar with a protractor. 2. Learn how to measure angles and identify their measures in degrees. Lets get started!
- 4. Check out theseangles from famous artist Pablo Picasso
- 5. And some otherart with angles…
- 6. So…what is anangle? • 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.
- 7. • Here aresome examples of angles.
- 8. • We canidentify 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.
- 9. Angle Measurements • Wemeasure the size of an angle using degrees. • Here are some examples of angles and their degree measurements.
- 10. Degrees you say… Hereis a circle. Circles have 360 degrees. Here is a Right Angle that measures 90 degrees. So a degree is 1/360 of the rotation of any given circle.
- 11. Acute Angles • Anacute angle is an angle measuring between 0 and 90 degrees. • The following angles are all acute angles.
- 12. Obtuse Angles • Anobtuse angle is an angle measuring between 90 and 180 degrees. • The following angles are all obtuse.
- 13. Right Angles • Aright angle is an angle measuring 90 degrees. • The following angles are both right angles.
- 14. Straight Angle • Astraight angle is 180 degrees.
- 15. GAME TIME! • Theobject of the game is to know your angles. Write your answer on a white board and after a few moments everyone will flip them up high. • The correct answer for each will be on the following slide!! • Good luck!
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