1 / 14

What Happened Yesterday?

What Happened Yesterday?. Let’s Review! Line Ray Line Segment Angle Vertex Point Triangles Intersection. 1.2 Measurement of Segments and Angles. Measuring segments :. Ruler or meter stick units of measure Match item being measured with proper unit.

gregoryholt
Télécharger la présentation

What Happened Yesterday?

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. What Happened Yesterday? • Let’s Review! • Line • Ray • Line Segment • Angle • Vertex • Point • Triangles • Intersection

  2. 1.2 Measurement of Segments and Angles Measuring segments: Ruler or meter stick units of measure Match item being measured with proper unit U.S.: Inches, feet, yards, miles etc. Metric: km, cm, m, mm

  3. Distance: absolute value A B m AB cm 1 2 3 4 |2-3| or |3-2| = |-1| = |1| = 1 = 1 The length of AB = 1 cm

  4. Measuring angles: Tool: protractor Unit of measure: Degrees

  5. Angle measurement Angle measurement is the opening from one ray to the next ray. We usually use the inside measurement, 180 degrees or less. A full turn is a circle and measures 360 degrees.

  6. Angle measurement m<PAR = 90 P  m<A = 90 A R m<1 = 135 1 Let’s think about the measure of the angle formed by the hands of a clock at 3:00 and 4:30

  7. Classify angles by size Acute: 0<90 Right: 90 Obtuse: 90<180 Straight: 180

  8. Parts of a degree: 1 Degree = 60’ (minutes) 1 Minute = 60” (seconds) So, 87  = 8730’ 90 = 8959’60”

  9. Find m<CBD m<ABD = 90 C A m<ABC = 7421’10” B D 90 - 7421’ 10” 1538’50”

  10. Congruent angles and segments Symbol: = = < have the same measure have the same length = A 60 B 60 <A = <B

  11. Congruency Tick marks show congruency X A B Z Y C Can you name congruent angles and segments?

  12. Example A B m<ABC = 90 m<1 = (3x+4) m<2 = (x+6) 1 2 C Find both angles! 3x + 4 + x + 6 = 90 so m < 1 = 64 4x + 10 = 90 m < 2 = 26 4x = 80 X = 20

  13. Recap! Acute Angle Congruent Angle Congruent Segments Degree Obtuse Angle Right Angle

  14. YOUR TURN Work with a partner Pg 14 #1,2, 5-8, 10, 12, 13-16, 18

More Related