Chapter 6 · Class 9 CBSE · Worksheet

Lines & Angles Worksheet — Class 9 CBSE Maths

Download a free printable worksheet with 30 questions at 3 difficulty levels. Includes full answer key.

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30 questions (Easy + Medium + Hard) with answer key. Fresh set generated daily.

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Sample Questions — Lines & Angles

Here are 8 sample questions from this worksheet. Download the full PDF for all 30 questions.

Q1.An angle measures 75°. What type of angle is its reflex angle?

A.Acute angle

B.Obtuse angle

C.Right angle

D.Reflex angle

Difficulty: Easy

Q2.Which of the following statements is TRUE regarding complementary and supplementary angles?

A.Complementary angles always form a linear pair.

B.The sum of two complementary angles is 180°.

C.Supplementary angles add up to 90°.

D.The sum of two supplementary angles is 180°.

Difficulty: Easy

Q3.Two angles, ∠PQR and ∠RQS, are adjacent. If a ray QS stands on a line PQ, and ∠PQS forms a straight angle, what can be concluded about ∠PQR and ∠RQS?

A.They are complementary angles.

B.They are vertically opposite angles.

C.They form a linear pair.

D.They are alternate interior angles.

Difficulty: Easy

Q4.If two lines intersect at a point, and one of the angles formed is 65°, what is the measure of its vertically opposite angle?

A.25°

B.115°

C.65°

D.180°

Difficulty: Easy

Q5.Ravi was solving a problem where two lines AB and CD intersect at O. He concluded that ∠AOC + ∠BOC = 90°. What mistake did Ravi make?

A.He assumed ∠AOC and ∠BOC are vertically opposite angles.

B.He assumed ∠AOC and ∠BOC are complementary angles.

C.He incorrectly applied the linear pair axiom.

D.He assumed line AB is perpendicular to CD.

Difficulty: Easy

Q6.In a diagram, two parallel lines 'm' and 'n' are intersected by a transversal 't'. If ∠1 and ∠2 are corresponding angles, which of the following statements is always true?

A.∠1 + ∠2 = 180°

B.∠1 = ∠2

C.∠1 + ∠2 = 90°

D.∠1 is always greater than ∠2

Difficulty: Easy

Q7.Two parallel lines 'p' and 'q' are intersected by a transversal 'r'. If an alternate interior angle is 110°, what is the measure of the other alternate interior angle?

A.70°

B.110°

C.20°

D.180°

Difficulty: Easy

Q8.If two parallel lines are intersected by a transversal, what is the relationship between the interior angles on the same side of the transversal?

A.They are always equal.

B.They are always complementary.

C.They are always supplementary.

D.They are always vertically opposite.

Difficulty: Easy

Answer Key — Sample Questions+

Q1:Reflex angle

Q2:The sum of two supplementary angles is 180°.

Q3:They form a linear pair.

Q4:65°

Q5:He incorrectly applied the linear pair axiom.

Q6:∠1 = ∠2

Q7:110°

Q8:They are always supplementary.

Download the full PDF for all 30 answers with step-by-step solutions.

About This Worksheet

Topic	Lines & Angles
Board	CBSE
Class	9
Total Questions	30 (10 Easy + 10 Medium + 10 Hard)
Answer Key	Included
Price	Free

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Frequently Asked Questions

Where can I download a free Lines & Angles worksheet for Class 9?+

You can download a free Lines & Angles PDF worksheet for Class 9 CBSE right here on SparkEd. The worksheet includes 30 questions at easy, medium, and hard levels with a complete answer key.

How many questions are in the Lines & Angles worksheet?+

Each SparkEd worksheet for Lines & Angles contains 30 questions — 10 easy, 10 medium, and 10 hard. A fresh set is generated daily so you never repeat the same sheet.

Does the Lines & Angles worksheet include answers?+

Yes. Every SparkEd worksheet comes with a separate answer key so students can self-check their work after completing the sheet.

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