Tiwari Academy Discussion

Suhana Ali

Asked: November 3, 2020In: Class 9

Why is Axiom 5, in the list of Euclid’s axioms, considered a ‘universal truth’? (Note that the question is not about the fifth postulate.)

NCERT Solutions for Class 9 Maths Chapter 5 Important NCERT Questions Introduction To Euclid’s Geometry NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 5.1 Page No:86 Questions No: 7

Suhana Ali

Asked: November 3, 2020In: Class 9

How would you rewrite Euclid’s fifth postulate so that it would be easier to understand?

NCERT Solutions for Class 9 Maths Chapter 5 Important NCERT Questions Introduction To Euclid’s Geometry NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 5.2 Page No:88 Questions No: 1

Suhana Ali

Asked: November 3, 2020In: Class 9

Does Euclid’s fifth postulate imply the existence of parallel lines? Explain.

NCERT Solutions for Class 9 Maths Chapter 5 Important NCERT Questions Introduction To Euclid’s Geometry NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 5.2 Page No:88 Questions No: 2

Kajal Aggarwal

Asked: November 3, 2020In: Class 9

In an isosceles triangle ABC, with AB = AC, the bisectors of Angle B and Angle C intersect each other at O. Join A to O. Show that: (i) OB = OC (ii) AO bisects Angle A

NCERT Solutions for Class 9 Maths Chapter 7 Important NCERT Questions Triangles NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 7.2 Page No:123 Questions No: 1

Kajal Aggarwal

Asked: November 3, 2020In: Class 9

ABC is a right angled triangle in which ∠A = 90° and AB = AC. Find ∠ B and ∠ C.

NCERT Solutions for Class 9 Maths Chapter 7 Important NCERT Questions Triangles NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 7.2 Page No:124 Questions No: 7

Kajal Aggarwal

Asked: November 3, 2020In: Class 9

AD is an altitude of an isosceles triangle ABC in which AB = AC. Show that (i) AD bisects BC (ii) AD bisects AngleA.

NCERT Solutions for Class 9 Maths Chapter 7 Important NCERT Questions Triangles NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 7.3 Page No:128 Questions No: 2

Kajal Aggarwal

Asked: November 3, 2020In: Class 9

BE and CF are two equal altitudes of a triangle ABC. Using RHS congruence rule, prove that the triangle ABC is isosceles.

NCERT Solutions for Class 9 Maths Chapter 7 Important NCERT Questions Triangles NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 7.3 Page No:128 Questions No: 4

Kajal Aggarwal

Asked: November 3, 2020In: Class 9

ABC is an isosceles triangle with AB = AC. Draw AP⊥BC to show that Angle B = Angle C.

NCERT Solutions for Class 9 Maths Chapter 7 Important NCERT Questions Triangles NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 7.3 Page No:128 Questions No: 5

Kajal Aggarwal

Asked: November 3, 2020In: Class 9

Show that of all line segments drawn from a given point not on it, the perpendicular line segment is the shortest.

NCERT Solutions for Class 9 Maths Chapter 7 Important NCERT Questions Triangles NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 7.4 Page No:123 Questions No: 6

Kajal Aggarwal

Asked: November 3, 2020In: Class 9

ABC is a triangle. Locate a point in the interior of Triangle ABC which is equidistant from all the vertices of Triangle ABC.

NCERT Solutions for Class 9 Maths Chapter 7 Important NCERT Questions Triangles NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 7.5 Page No:133 Questions No: 1

Why is Axiom 5, in the list of Euclid’s axioms, considered a ‘universal truth’? (Note that the question is not about the fifth postulate.)

How would you rewrite Euclid’s fifth postulate so that it would be easier to understand?

Does Euclid’s fifth postulate imply the existence of parallel lines? Explain.

In an isosceles triangle ABC, with AB = AC, the bisectors of Angle B and Angle C intersect each other at O. Join A to O. Show that: (i) OB = OC (ii) AO bisects Angle A

ABC is a right angled triangle in which ∠A = 90° and AB = AC. Find ∠ B and ∠ C.

AD is an altitude of an isosceles triangle ABC in which AB = AC. Show that (i) AD bisects BC (ii) AD bisects AngleA.

BE and CF are two equal altitudes of a triangle ABC. Using RHS congruence rule, prove that the triangle ABC is isosceles.

ABC is an isosceles triangle with AB = AC. Draw AP⊥BC to show that Angle B = Angle C.

Show that of all line segments drawn from a given point not on it, the perpendicular line segment is the shortest.

ABC is a triangle. Locate a point in the interior of Triangle ABC which is equidistant from all the vertices of Triangle ABC.

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