Lines, Angles and Triangles

1. LINES, ANGLES, AND TRIANGLES

2. LINES

3. Lines A line is a series or connection of points. It has length but has no width or thickness . It may be straight , curved or a combination of the two .

4. Lines A straight line is unlimited in extent. It may be extended in either direction infinitely. It is generated by a point moving always in the same direction.

5. Lines A curved line is generated by a point moving in a continuously changing direction.

6. Lines A ray is the part of a straight line beginning at a given point and extending limitlessly in one direction.

7. Lines A line segment is a part of a straight line between two of its points. The two points of line segment is called endpoints .

8. Lines A line is named or designated by capital letters of any two points or by a small letter .

9. ANGLES

10. Angles An angle is a figure formed by two rays with a common endpoint. The rays are the sides of an angle, while the end point is its vertex .

11. Angles Kinds of Angles: Acute angle – is an angle that measures less than 90 ◦ Right angle – is an angle that measures exactly 90 ◦

12. Angles Obtuse angle – is an angle whose measure is more than 90 ◦ and less than 180 ◦ Straight angle – is an angle that measures exactly 180 ◦

13. Angles Reflex angle – is an angle whose measure is more than 180 ◦ and less than 360 ◦

14. Angles Examples of Angles:

15. Angles

16. TRIANGLES

17. Triangles A triangle is a polygon having three sides .

18. Triangles Kinds of Triangles: (According to LENGTH of Sides) Scalene triangle – is a triangle having no congruent sides

19. Triangles Isosceles triangle – is a triangle having at least two congruent sides Equilateral triangle – is a triangle having three equal sides

20. Triangles Kinds of Triangles: (According to the its ANGLES) Right triangle – is a triangle having a right angle

21. Triangles Obtuse triangle – is a triangle having an obtuse angle Acute triangle – is a triangle having three acute angles

22. Triangles The Pythagorean Theory : a 2 = b 2 + c 2 A theorem attributed to Pythagoras that the square of the hypotenuse of a right triangle is equal to the sum of the squares of the other two sides.

23. End of Presentation … THANK YOU !!! 

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