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Lines and Angles Practice Questions

Class 9 · Mathematics · 2916 free MCQs with instant results and detailed explanations.

2916
Total
960
Easy
1422
Medium
534
Hard

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Topics in Lines and Angles

Parallel Lines and Transversal 844
Angle Sum Property of Triangle 550
Pairs of Angles 717
Basic Terms 805

Sample Questions from Lines and Angles

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Q1
Easy
What is the sum of angles on a straight line?
A. 180 degrees
B. 90 degrees
C. 360 degrees
D. 270 degrees
Show Answer & Explanation
Correct Answer: A
The sum of angles on a straight line is always 180 degrees.
Q2
Easy
What do you call two angles that add up to 180 degrees?
A. Complementary angles
B. Supplementary angles
C. Adjacent angles
D. Vertical angles
Show Answer & Explanation
Correct Answer: B
Angles that add up to 180 degrees are known as supplementary angles.
Q3
Easy
Which of the following is true about vertical angles?
A. They are always equal
B. They add up to 180 degrees
C. They are adjacent
D. They are complementary
Show Answer & Explanation
Correct Answer: A
Vertical angles are formed by intersecting lines and are always equal.
Q4
Medium
In a pair of intersecting lines, what is the relationship between the vertically opposite angles?
A. They are equal.
B. They are supplementary.
C. They are complementary.
D. They are always acute.
Show Answer & Explanation
Correct Answer: A
Vertically opposite angles are those formed when two lines intersect. They are always equal to each other.
Q5
Medium
If a transversal intersects two parallel lines, what is the sum of the interior angles on the same side of the transversal?
A. 90 degrees
B. 180 degrees
C. 360 degrees
D. 45 degrees
Show Answer & Explanation
Correct Answer: B
The interior angles on the same side of a transversal intersecting parallel lines are supplementary, meaning their sum is 180 degrees.
Q6
Medium
What type of angle is formed when the sum of two angles equals 90 degrees?
A. Acute angle
B. Right angle
C. Complementary angle
D. Supplementary angle
Show Answer & Explanation
Correct Answer: C
Angles that sum to 90 degrees are called complementary angles.
Q7
Medium
If two angles are supplementary, and one measures 65 degrees, what is the measure of the other angle?
A. 115 degrees
B. 125 degrees
C. 135 degrees
D. 105 degrees
Show Answer & Explanation
Correct Answer: A
Supplementary angles sum to 180 degrees. Therefore, the other angle is 180 - 65 = 115 degrees.
Q8
Hard
If two lines intersect at a point and form an angle of 60 degrees, what is the measure of each of the vertically opposite angles?
A. 60 degrees
B. 120 degrees
C. 30 degrees
D. 90 degrees
Show Answer & Explanation
Correct Answer: B
Vertically opposite angles are equal. A 60-degree angle has a vertically opposite angle of 120 degrees (180 - 60).
Q9
Hard
Two angles are supplementary. If one angle measures 75 degrees, what is the other angle's measure?
A. 105 degrees
B. 80 degrees
C. 90 degrees
D. 75 degrees
Show Answer & Explanation
Correct Answer: A
Supplementary angles add up to 180 degrees. Therefore, 180 - 75 = 105 degrees.
Q10
Hard
If two parallel lines are cut by a transversal, which of the following pairs of angles are corresponding angles?
A. Angle 1 and Angle 5
B. Angle 2 and Angle 6
C. Angle 3 and Angle 7
D. Angle 4 and Angle 8
Show Answer & Explanation
Correct Answer: A
Corresponding angles are on the same side of the transversal and in corresponding positions.

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Lines and Angles — Class 9 Mathematics Practice Questions Online

This page contains 2916 practice MCQs for the chapter Lines and Angles in Class 9 Mathematics. The questions are organized by difficulty — 960 easy, 1422 medium, 534 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 4 topics, giving you comprehensive coverage of the entire chapter.