1 2 A 2 B 2 C 2 D Let's

West Bengal - Mathematics

20. Geometrical Proofs

1. Revision
2. Pie Chart
3. Rational Numbers
4. Multiplication and Division of Polynomials
5. Cubes
6. Complementary Angles, Suplementary Angles and Adjacent Angles
7. Concept of Vertically Opposite Angles
8. Properties of Parallel Lines and Their Transversal
9. Relation Between the Two Sides of a Triangle and Their Opposite Angles
10. Rule of Three
11. Percentage
12. Mixture
13. Factorisation of Algebraic Expressions
14. HCF and LCM of Algebraic Expression
15. Simplification of Algebraic Expression
16. Verification of the Relation Between the Angles and Sides of a Triangle
17. Time and Work
18. Graphs
19. Formation of an Equation and its Solution
20. Geometrical Proofs
21. Construction of Triangles
22. Construction of Parallel Lines
23. Dividing a Line Segment into Three or Five Equal Parts

Lets Do 20.1

Lets Do 20.2

1 2 A 2 B 2 C 2 D Let's

Lets Work Out 20.1

1 2 A 2 B 3 4 A 4 B 5 6 7 8

Lets Do 20.3

Lets Work Out 20.2

1 A 1 B 1 C 1 D 1 E 1 F 2 3 4 5 6 A 6 B 6 C 6 D 6 E 6 F 7 A 7 B 7 C 7 D 7 E 8 A 8 B 8 C 8 D 8 E 8 F 9 10 11 12 13 14 15 16

Lets Work Out 20.3

Q. 2 C5.0( 1 Vote )

Let's observe the

Class 8th West Bengal - Mathematics 20. Geometrical Proofs

Answer :

Let

First side, = 2.7cm,

Second Side, = 6.1cm

Third Side, = 8.8cm

We know that,

The Triangle Inequality Theorem,

So, we have a = 2.7cm, b = 6.1cm and c = 8.8cm

Now, we have to check that these given sides satisfy the triangle inequality or not.

2.7 + 6.1 = 8.8 ≯ 8.8

2.7 + 8.8 = 11.5 > 6.1

6.1 + 8.8 = 14.9 > 2.7

No, through the given lengths we can’t draw a triangle.

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