1 / 13

7-5 6 th grade math

7-5 6 th grade math. Classifying and Measuring Angles. Objective. To draw, measure, and classify angles Why? To know how to correctly use a protractor or name angles without a protractor. To help you understand more geometry (see you in 9 th grade). California State Standards.

berny
Download Presentation

7-5 6 th grade math

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 7-56th grade math Classifying and Measuring Angles

  2. Objective • To draw, measure, and classify angles • Why? To know how to correctly use a protractor or name angles without a protractor. To help you understand more geometry (see you in 9th grade).

  3. California State Standards MG 2.1 (Gr 5): Measure, identify, and draw angles, but using appropriate tools … MR 1.0: Deepen your understanding of the measurement of plane and solid shapes and use this understanding to solve problems.

  4. Vocabulary • Point • An exact location in space • . X • Line • An endless collection of points along a straight path. A line has no end points • . . . . E F G H • Line segment • A part of a line having two endpoints • . . A B

  5. Vocabulary • Ray • A part of a line that has one endpoint and goes on and on in one direction . • Angle • Two rays with common endpoints called the vertex . Read with .A vertex in the middle. ∠ABC .B .C • Vertex • The common endpoint of the two rays that form the sides of an angle. See above. • The point of intersection of two sides of a polygon. . The point of intersection of three edges of a space figure. . .

  6. Vocabulary • Plane • A flat surface extending endlessly in all directions • Protractor • An instrument used to measure angles or draw angles • Congruent • Same shape and same size • ≈ is the symbol for congruent. Also seen above an equal sign.

  7. Classification Vocabulary • Right angle • An angle that measure 90°. Often has a ‘corner’ mark • ┐ • Obtuse angle • An angle that measures more than 90° and less than 180° • Acute angle • An angle that measure less than 90° and more than 0° • Straight angle • An angle with a measure of 180°

  8. How to Measure with a Protractor 1)Observe is angle is obtuse (past 90°) or acute (less 90°) 2)Place hole in center of protractor at vertex. Line up ray with the 0° mark 3) If obtuse angle, read the protractor’s measure past 90°. If acute angle, read the protractor’s measure less 90°. .

  9. How to Draw with a Protractor 1)Observe is angle is obtuse (past 90°) or acute (less 90°) 2)Place hole in center of protractor at vertex. Line up ray with the 0° mark 3) If obtuse angle, read the protractor’s measure past 90°. If acute angle, read the protractor’s measure less 90°. *) Angles can be drawn in any direction: left, right, sideways; as long as ‘opening’ is correct measurement. .

  10. Try It! Measure and classify 1. 2. 3. 4. • ∠ ABC 50°, acute 2) ∠ XYZ 120°, obtuse • ∠ OPQ 68°, acute • ∠ DEF 117°, obtuse

  11. Try Some More! Draw and classify 5) 40° 6) 100° 7) 25° 8) 180° 9) At 3:00, what type of angle is formed? 5) acute 6) obtuse 7) acute 8) straight 9) 90°

  12. Objective Review • To draw, measure, and classify angles • Why? You now know how to correctly use a protractor or name angles without a protractor. • This will help you understand more geometry (see you in 9th grade). • Learning how to identify and label basic geometric figures and how to classify, measure, and draw angles can help you understand basic geometric ideas and relationships.

  13. Independent Practice • Complete problems 10-21 • Copy original problem first. • Show all work! • If time, complete Mixed Review: 22-29 • If still more time, work on Accelerated Math.

More Related