# CBSE Class 9 Maths Exam 2020-21: NCERT Based Extra Questions (With Answers) - Chapter 7 Triangles

Mayank Uttam

CBSE: Check important extra questions for the upcoming CBSE Class 9 Maths exam 2020-21 from Chapter 7 Triangles of Class 9 Maths NCERT textbook. Answers to all the problems are also available here. Students with sound knowledge of basic concepts of this chapter can easily attempt the questions in less than 5 minutes. These questions might be also asked in CBSE School examinations with a little modification.

CBSE Class 9 Maths Exam 2020-21: Extra Questions (With Answers) - Chapter 7 Triangles

Question: The sides opposite to equal angles of a triangle

(i) might be equal

(ii) are always equal

(iii) are always unequal

(iv) are unpredictable in length

The sides opposite to equal angles of a triangle are always equal.

CBSE Class 9 Revised Syllabus for 2020-2021

Question: ABC is an isosceles triangle with AB = AC. Suppose there is a point P such that AP ⊥ BC then

(i) ∠ B ≠ ∠ C

(ii) ∠ B = ∠ C

(iii) ∠ B > ∠ C

(iv) ∠ B < ∠ C.

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ABC is an isosceles triangle with AB = AC. P is a point such that if AP ⊥ BC then ∠ B = ∠ C. (NCERT textbook Class 9 Maths NCERT EXERCISE 7.3, Question 5)

If two sides of a triangle are unequal, the angle opposite to the ______ side is ______.

The correct option to fill in the blanks is

(i) longer, unpredictable

(ii) shorter, longer

(iii) longer, shorter

(iv) longer, larger

If two sides of a triangle are unequal, the angle opposite to the longer side is larger (or greater).

Questions: If ∆ MNO ≅ ∆ PQR Mnd ∆ MNO is not congruent to ∆ RPQ, then which of the following is not true:

(i) NO = PQ (ii) MO = PR (iii) QR = NO (iv) MN = PQ

Question: In triangles MNC and DEF, ∠M = ∠D, ∠N = ∠E and MN = EF. Will the two triangles be congruent? Give reasons for your answer.

Answer: Two triangles need not be congruent, because MN and EF are not corresponding sides in the two triangles.

Question: Complete the sentence given below

Two figures are congruent if they are of the _____________________.

Two figures are congruent if they are of the same shape and the same size.

Question: What is the value of each angle in an equilateral triangle?

60 Degree.

Question: which of the following options in relation with a triangle ABC is correct?

(i) AB + BC > AC

(ii) BC + CA > AB

(iii) AB + AC > BC

(iv) All (i), (ii), (iii) are correct

It is because, in a triangle, the sum of any two sides of a triangle is greater than the third side.

Question: In a right angled triangle, the greatest side is known as the _______.