1 / 18

Geometry

Geometry. Agenda: ENTRANCE Review Practice 1-3 QUIZ Foldable Sec. 1.4 – Measuring Segments and Angles Practice Assignment Exit Measurement Activity. 1-4 Measuring Segments and Angles. Congruent segments. Two segments with the same length. AB = 2.5 cm CD = 2.5 cm.

shelley
Download Presentation

Geometry

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. Geometry • Agenda: • ENTRANCE • Review Practice 1-3 • QUIZ • Foldable • Sec. 1.4 – Measuring Segments and Angles • Practice Assignment • Exit • Measurement Activity

  2. 1-4 Measuring Segments and Angles

  3. Congruent segments • Two segments with the same length AB = 2.5 cm CD = 2.5 cm

  4. Midpoint of a segment • A point that divides a segment into two congruent segments. Point Y is the midpoint of

  5. Bisect • To cut into two equal or congruent parts Point Y bisects Line n bisects

  6. Angle • Formed by two rays with the same endpoint An angle can be named in four ways

  7. Classifying Angles • Acute—less than 90º • Right—equal to 90º • Obtuse—greater than 90º but less than 180º • Straight—equal to 180º

  8. Congruent angles • Two angles with the same measurement

  9. Postulate 1-5 Ruler Postulate • The points of a line can be put into one-to-one correspondence with the real numbers so that the distance between any two points is the absolute value of the difference of the corresponding numbers. AB = | -4 – 2 | = | -6 | = 6

  10. Postulate 1-6 Segment Addition Postulate • If three points A, B, and C are collinear and B is between A and C, then AB + BC = AC AB + BC = AC 2 + 7 = 9

  11. Postulate 1-7 Protractor Postulate

  12. Postulate 1-8 Angle Addition Postulate • If point B is in the interior of ADC, then mADB + mBDC = mADC. • If ADC is a straight angle, then mADB + mBDC = 180º. mADB + mBDC = mADC mADB + mBDC = 180º 142 + 38 = 180 84 + 39 = 123

  13. Example #1 • If AB = 25, find the value of x. Then find AN and NB.

  14. Example #2 • Point M is the midpoint of . Find RM, MT, and RT.

  15. Example #3 • Name the angle in four ways.

  16. Example #4 • Suppose that m1 = 42º and mABC = 88º. Find m2.

  17. Example #5 • If mDEG = 145º, find mGEF.

  18. Assignment/Practice • Practice 1-4 • 1-3, 5, 6, 8, 12-17, 21 • Measurement Activity

More Related