Triangle2(adarsh Nagar)
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WELCOME IT IS THE WORLD OF MATHS
GEOMETRY TO LEARN ABOUT TRIANGLE
OBJ ECT IVE TO MAKE THE STUDENTS FAMILIAR WITH THE TRIANGLES OF DIFFERENT TYPES
Characteristics of a Triangles Look at the following figures which, figures are Triangle.
How do we differentiate triangle from other plain figure?
A triangle is made of three line segment only. A
B
C
•
How many line segment are there in the triangle A B C.
•
How many vertices are there in the triangle A B C.
•
How many angle angle are there in the triangle A B C
T hus a t riangle h as thr ee li ne se gment, thr ee v er tic es a nd thr ee a ngle s. Lin e se gment o f tria ngle s ar e a lso c alle d sid es the t ria ngle s.
Properties of a triangles. •
The sum of the length of any two sides of a triangle is greater than the length of the third side.
Measure of all three angle of each of triangle . •The sum of measure of three angles is 180o 1
2
3
1 2
3
CLASSIFICATION OF TRIANGLE ACCORDING TO SIDE
i All Sides Are Of The Same Length
Equilateral Triangle
ii Two Side of The Same Length
Isosceles Triangle
iii All Sides Are of Different Length
Scalene Triangle
CLASSIFICATION OF TRIANGLE ACCORDING TO ANGLES 44O 28O
350
70O
75O
122O
30O
46O
90O
All Acute One Obtuse One Right Angle Angles Angle •A triangle with all angles as acute is called acute angled triangle •A triangle with one obtuse angle is called obtuse triangle •A triangle with one right angle is called right triangle
RECALL THE FACTS • CAN A TRIANGLE HAVE TWO RIGHT ANGLES? • CAN A TRIANGLE HAVE TWO OBTUSE ANGLES? • CAN A TRIANGLE HAVE ONE OBTUSE ANGLE?
GEOMETRY TO LEARN ABOUT TRIANGLE
OBJ ECT IVE TO MAKE THE STUDENTS FAMILIAR WITH THE TRIANGLES OF DIFFERENT TYPES
Characteristics of a Triangles Look at the following figures which, figures are Triangle.
How do we differentiate triangle from other plain figure?
A triangle is made of three line segment only. A
B
C
•
How many line segment are there in the triangle A B C.
•
How many vertices are there in the triangle A B C.
•
How many angle angle are there in the triangle A B C
T hus a t riangle h as thr ee li ne se gment, thr ee v er tic es a nd thr ee a ngle s. Lin e se gment o f tria ngle s ar e a lso c alle d sid es the t ria ngle s.
Properties of a triangles. •
The sum of the length of any two sides of a triangle is greater than the length of the third side.
Measure of all three angle of each of triangle . •The sum of measure of three angles is 180o 1
2
3
1 2
3
CLASSIFICATION OF TRIANGLE ACCORDING TO SIDE
i All Sides Are Of The Same Length
Equilateral Triangle
ii Two Side of The Same Length
Isosceles Triangle
iii All Sides Are of Different Length
Scalene Triangle
CLASSIFICATION OF TRIANGLE ACCORDING TO ANGLES 44O 28O
350
70O
75O
122O
30O
46O
90O
All Acute One Obtuse One Right Angle Angles Angle •A triangle with all angles as acute is called acute angled triangle •A triangle with one obtuse angle is called obtuse triangle •A triangle with one right angle is called right triangle
RECALL THE FACTS • CAN A TRIANGLE HAVE TWO RIGHT ANGLES? • CAN A TRIANGLE HAVE TWO OBTUSE ANGLES? • CAN A TRIANGLE HAVE ONE OBTUSE ANGLE?
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