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Class 9 Mathematics — Chapter 7: Triangles

90 practice questions · 30 Easy · 30 Medium · 30 Hard

Free NCERT-aligned multiple-choice practice for Class 9 Mathematics, Chapter 7 (Triangles). Practise timed Easy, Medium and Hard quizzes with instant explanations — built for CBSE Board exams, JEE Main and NEET UG. Here are a few sample questions; sign in free to practise all 90.

Sample questions

Q1Easy

Two triangles are congruent by SAS if:

A.Three sides are equal
B.Two sides and the included angle are equal✓ correct
C.Two angles and any side are equal
D.Two sides and a non-included angle are equal
Why

SAS congruence: two sides and the included angle (angle between them) are equal.

Q2Medium

In isosceles ΔABC, AB=AC, and ∠A = 40°. Find ∠B.

A.70°✓ correct
B.40°
C.80°
D.140°
Why

AB=AC → ∠B=∠C. ∠A+∠B+∠C=180°→40°+2∠B=180°→∠B=70°.

Q3Hard

In ΔABC, exterior angle at A is 120°. Which must be true?

A.Each of ∠B and ∠C < 120°
B.∠B + ∠C = 120°
C.∠A = 60°
D.Both (a) and (b) are true✓ correct
Why

Exterior angle at A = ∠B + ∠C = 120°. Also, each of ∠B, ∠C < 120°. Both (a) and (b) are true.

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