triangles and angles (on the basis of sides and angles)

did you aware of triangles and its types and angles and it types
let me show by this powerpoint presentation

1. Good morning to all of you present
here
I am Sachin Meena Of Class IX A
Today I am presenting a
presentation in front of you

2. Topic
Types Of Angles
And Triangles(on the basis of
angles and sides)

3. Angles - In mathematics, if two rays start from the
same point, the figure so formed is called an angle.

Examples -

4. The point where the rays intersect is called the vertex
of the angle. Here B is vertex. The two rays are called
the arms of the angle. Here BA and BC are arms of
angle ABC.
A
(Vertex) B
C
a rm
arm
(Vertex) B
A
(Vertex) B

5. TYPES OF ANGLES
There are five types of angles:-
1)Acute angle
2)Right angle
3)Obtuse angle
4)Straight angle
5)Reflex angle

6. Acute angle- An angle whose measure is
more than 0 but less than 90 is called an acute angle.

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A
B60

7. Right angle- An angle whose measure is 90 is called a
right angle.
P
O
Q
P
O
Q

8. Obtuse angle – An angle whose measure is more
than 90 but less than 180 is called an obtuse
angle.
P
Q
R
120

9. Straight angle – An angle whose measure is
180 is called a straight angle.
DB O D
180

10. Reflex angle – An angle whose measure is more
than 180 but less than 360 is called a reflex angle.
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P
Q R

11. TRIANGLES
A triangle is a 3-sided polygon. Every triangle has
three sides, three vertices and three angles

12. TYPES
OF TRIANGLES

13. TYPES OF TRIANGLES
On Basis of Length of Sides, there are 3 types of
Triangles
Equilateral Triangle
Isosceles Triangle
Scalene Triangle
On Basis of Angles, there are 3 types of triangles
Acute Angled Triangle
Obtuse Angled Triangle
Right Angled Triangle

14. EQUILATERAL TRIANGLE
Triangles having all sides equal are called
Equilateral Triangle.
ISOSCELES TRIANGLE
Triangles having 2 sides equal are called
Isosceles Triangle.

15. SCALENE TRIANGLE
Triangles having no sides equal are called
Scalene Triangle.

16. Triangles whose all angles are acute
angle are called Acute Angled Triangle.
ACUTE ANGLED TRIANGLE
RIGHT ANGLED TRIANGLE
OBTUSE ANGLED TRIANGLE
Triangles whose 1 angle is obtuse angle
are called Obtuse Angled Triangle.
Triangles whose 1 angle is right angle are
called Right Angled Triangle.