Check the below NCERT MCQ Questions for Class 9 Maths Chapter 6 Lines and Angles with Answers Pdf free download. MCQ Questions for Class 9 Maths with Answers were prepared based on the latest exam pattern. We have provided Lines and Angles Class 10 Maths MCQs Questions with Answers to help students understand the concept very well.
Students can also refer to NCERT Solutions for Class 9 Maths Chapter 6 Lines and Angles for better exam preparation and score more marks.
Class 9 Maths Chapter 6 MCQ With Answers
Maths Class 9 Chapter 6 MCQs On Lines and Angles
Question 1.
In ΔABC, ∠A = 50° and the external bisectors of ∠B and ∠C meet at O as shown in figure. The measure of ∠BOC is
(a) 40°
(b) 65°
(c) 115°
(d) 140°
Answer
Answer: (b) 65°
Question 2.
In figure the value of x is
(a) 120°
(b) 130°
(c) 110°
(d) 100°
Answer
Answer: (b) 130°
Question 3.
An exterior angle of a triangle is 80° and the interior opposite angles are in the ratio 1 : 3, measure of interior opposite angles are
(a) 30°, 90°
(b) 40°, 120°
(c) 20°, 60°
(d) 30°, 60°
Answer
Answer: (c) 20°, 60°
Reference Angle Calculator tool helps in finding a reference angle for degrees and radians.
Question 4.
In ΔABC, the bisectors of ∠ABC and ∠BCA intersect each other at O. The measure of ∠BOC is
(a) 90° + ∠A
(b) 90° + \(\frac{∠A}{2}\)
(c) 180 – ∠A
(d) 90° – \(\frac{∠A}{2}\)
Answer
Answer: (b) 90° + \(\frac{∠A}{2}\)
Question 5.
In figure if ∠A + ∠B + ∠C + ∠D + ∠E + ∠F = k right angles, then find value of k.
(а) 2
(b) 3
(c) 4
(d) 5
Answer
Answer: (c) 4
Question 6.
In the given figure, the measure of ∠ABC is
(a) 80°
(b) 20°
(c) 100°
(d) 60°
Answer
Answer: (a) 80°
Question 7.
The angle of a triangle are in the ratio 5 : 3 : 7, the triangle is
(а) an acute-angled triangle
(b) an obtuse angled triangle
(c) an right angled triangle
(d) an isosceles triangle.
Answer
Answer: (а) an acute-angled triangle
Question 8.
In figure l1 || l2, the value of x is
(a) 80°
(b) 100°
(c) 110°
(d) 70°
Answer
Answer: (a) 80°
Question 9.
If one angle of triangle is equal to the sum of the other two, then the triangle is
(a) an isosceles triangle
(b) an obtuse-angled triangle
(c) an equilateral triangle
(d) a right triangle
Answer
Answer: (d) a right triangle
Question 10.
One of the angles of a triangle is 75°. If the difference of other two is 35°, then the largest angle of other two angles has a measure
(a) 80°
(b) 75°
(c) 70°
(d) 135°
Answer
Answer: (c) 70°
Question 11.
An exterior angle of a triangle is 105° and its two interior opposite angles are equal. Each of these equal angles is
(a) 37 \(\frac{1°}{2}\)
(b) 52 \(\frac{1°}{2}\)
(c) 72 \(\frac{1°}{2}\)
(d) 75°
Answer
Answer: (b) 52 \(\frac{1°}{2}\)
Question 12.
In Figure measure of ∠ABC is
(a) 60°
(b) 70°
(c) 80°
(d) 50°
Answer
Answer: (a) 60°
Question 13.
In Figure AB || CD, the value of x is
(a) 35°
(b) 40°
(c) 60°
(d) 75°
Answer
Answer: (d) 75°
Question 14.
In the figure, PS ⊥ l, RQ ⊥ l, the degree measure of y is
(a) 55°
(b) 90°
(c) 80°
(d) 135°
Answer
Answer: (c) 80°
Question 15.
Each angle of an equilateral triangle is
(a) 50°
(b) 90°
(c) 54°
(d) 60°
Answer
Answer: (d) 60°
Question 16.
Given lines l1 || l2 and l2 || l3 in figure. The value of x is
(a) 40°
(b) 140°
(c) 50°
(d) 80°
Answer
Answer: (b) 140°
Question 17.
In figure, find the value of y.
(a) 28°
(b) 40°
(c) 140°
(d) 56°
Answer
Answer: (a) 28°
Question 18.
In the given figure, if AOB is a straight line, then ∠BOC is
(a) 80°
(b) 70°
(c) 60°
(d) 20°
Answer
Answer: (a) 80°
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