This document provides definitions and examples related to different types of angles in geometry. It defines a line segment, straight line, and ray. It then discusses the measurement of angles using a protractor and defines different types of angles including acute, right, obtuse, straight, and reflex angles. Examples are given of classifying angles based on their degree measures. Students are assigned an exercise to define the type of each angle in a diagram and homework from the workbook.

1. HelloHello!!!!
Maths loversMaths lovers 

2. Our lesson today in…..
Geometry

3. Firstly….
What’s the deference between,

4. ExcellentExcellent,,
As you noticedAs you noticed!!!!

5. We called them..
Line segment,
Straight line
And Ray

6. DefinitionsDefinitions::
A line segment:
A set 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:
Has an 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:
 The line 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
AB is a subset of AB and
AB is a subset of AB

10. What will happen if 2What will happen if 2
rays have the samerays have the same
starting pointstarting point??

11. AB and AC are 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 of the
angle:
The angle is measured (by using the
protractor(
 With degree unit) ° (
 The measure of ^BAC is written..
m (^BAC(

13. The type of angles:
①zero angle
CA B
Its measure = 0°
Its sides are coincident.

14. ②Acute angle
A C
B
Its measure is more than 0° and less than
90°
 0° < m (^BAC) < 90°

15. ③Right angle
Its measure is 90°
 m (^BAC) = 90°
B
A C

16. ④Obtuse angle
A C
B
Its measure is more than 90° and less than 180°
 90° < m (^BAC) < 180°

17. ⑤Straight angle
CAB
Its measure is 180°
Its sides are forming one straight line.
 m (^BAC) = 180°

18. ⑥Reflex angle
B
A C
Its measure is more than 18° and less than 360°
 180° < m (^BAC) < 360°

19. Example:
Mention the type of 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:

21. GOo0oOo0d
We almost finished…. 

22. Exercise:
Define the type of each angle in the
following shape
6
2
3
4
5
1
7

23. Try to solve them inTry to solve them in
your note bookyour note book

24. H.W
Work book p.26:Ex.1-20
And page 28

25. Miss Magda is proud of her students
Excellent

26. Bye…byeBye…bye