Project On Properties And Construction Of Triangle

PROJECT ON PROPERTIES AND CONSTRUCTION OF TRIANGLE

DEFINATION OF TRIANGLE  Geometric

figure consisting of three points, called vertices, connected by VERTEX three sides. A

B

C

PROPERTIES

 It

has three sides  It has three angles  Sum of three angles of a triangle is 1800

CLASSIFICATION OF TRIANGLE SIDE WISE  Scalene triangles  Isosceles triangles  Equilateral triangles

Scalene triangles 

Scalene triangles have no equal sides A

3 cm

5 cm

C 7 cm B B

Isosceles triangles 

Isosceles triangles have two equal sides . A

4 cm

4 cm

B

C 3 cm

Equilateral triangles 

equilateral triangles have three equal sides A

5 cm

5 cm

C B

5 cm

  

CLASSIFICATION OF TRIANGLE ANGLE WISE

Acute angled triangle Right angled triangle Obtuse angled triangle

ACUTE ANGLED TRIANGLES 

Whose one angle is less than 900 A

600 B

C

RIGHT ANGLED TRIANGLES 

Whose one angle is equal to 900

90O

OBTUSE ANGLED TRIANGLES 

Whose one is greater than 900 A

120O B

C

CONSTRUCTION OF TRIANGLE For Example :Construct a triangle in which BC=5 cm, angle B=600 and AB=4 cm .Measure the third side.

1. With the help of ruler draw a line of 5 cm . B

5 cm

C

2. With a point B ,draw a angle 60 0 with the help of campus.

60O B

5 cm

C

3. From point B ,with the help of campus draw a arc of 4 cm and mark this point as A A 4 cm

B

C 5 cm

4. Combine AC A 4 cm

B

5 cm

C