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math presentation
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- 2. Our lesson todayin….. Geometry
- 3. Firstly…. What’s the deferencebetween,
- 4. ExcellentExcellent,, As you noticedAsyou noticed!!!!
- 5. We called them.. Linesegment, Straight line And Ray
- 6. DefinitionsDefinitions:: A line segment: Aset of points…..consisting of 2 distinct points like A and B (when we join them by a ruler( AB¯=BA¯ We can`t draw more than 1 line segment joining 2 points It has 2 ends points ≈ It has length A B
- 7. DefinitionsDefinitions:: A straight line: Hasan infinite ∞ number of points on it. The 2 arrows show that it can be extended without limit on its 2 sides AB¯=BA¯ We can`t draw more than 1 straight line joining 2 points. It has no starting point and no ending point so…we cant measure its length. A B
- 8. DefinitionsDefinitions:: A Ray: Theline segment AB¯ and all the points on the right side of the point B is a ray. The arrow show that it can be extended without limit on its 1 sides. AB¯ differs from BA¯ It has a starting point and no ending point so…we cant measure its length. A B
- 9. Straight line ray Line segment ABis a subset of AB and AB is a subset of AB
- 10. What will happenif 2What will happen if 2 rays have the samerays have the same starting pointstarting point??
- 11. AB and ACare 2 rays having the same starting point A ..they made an angle A B C ) side ( )side( )the vertex of the angle(
- 12. The measuring ofthe angle: The angle is measured (by using the protractor( With degree unit) ° ( The measure of ^BAC is written.. m (^BAC(
- 13. The type ofangles: ①zero angle CA B Its measure = 0° Its sides are coincident.
- 14. ②Acute angle A C B Itsmeasure is more than 0° and less than 90° 0° < m (^BAC) < 90°
- 15. ③Right angle Its measureis 90° m (^BAC) = 90° B A C
- 16. ④Obtuse angle A C B Itsmeasure is more than 90° and less than 180° 90° < m (^BAC) < 180°
- 17. ⑤Straight angle CAB Its measureis 180° Its sides are forming one straight line. m (^BAC) = 180°
- 18. ⑥Reflex angle B A C Itsmeasure is more than 18° and less than 360° 180° < m (^BAC) < 360°
- 19. Example: Mention the typeof each of the angles which their measures are as follow 32° 90° 110° 180° 250° 159⅜°
- 20. 32° ►acute 90° ►Right 110° ►Obtuse 180° ►straight 250° ►reflex 159⅜° ►obtuse Solution:
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- 22. Exercise: Define the typeof each angle in the following shape 6 2 3 4 5 1 7
- 23. Try to solvethem inTry to solve them in your note bookyour note book
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- 25. Miss Magda isproud of her students Excellent
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