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Lines and Angles Practice Questions

Class 7 · Mathematics · 452 free MCQs with instant results and detailed explanations.

452
Total
198
Easy
204
Medium
50
Hard

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Topics in Lines and Angles

Vertically Opposite 140
Linear Pair 79
Adjacent Angles 101
Complementary Angles 56
Supplementary Angles 76

Sample Questions from Lines and Angles

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

Q1
Easy
If one angle measures 30 degrees, what is the measure of its complementary angle?
A. 60 degrees
B. 90 degrees
C. 30 degrees
D. 120 degrees
Show Answer & Explanation
Correct Answer: A
Complementary angles add up to 90 degrees. 90 - 30 = 60 degrees.
Q2
Easy
Which pair of angles are complementary?
A. 30 degrees and 60 degrees
B. 45 degrees and 45 degrees
C. 80 degrees and 10 degrees
D. 50 degrees and 40 degrees
Show Answer & Explanation
Correct Answer: C
30 + 60 = 90, 45 + 45 = 90, but the only pair that sums to 90 is 80 + 10.
Q3
Easy
If angle J measures 35 degrees, what is the measure of the complementary angle?
A. 55 degrees
B. 45 degrees
C. 65 degrees
D. 75 degrees
Show Answer & Explanation
Correct Answer: A
Complementary angle = 90 - 35 = 55 degrees.
Q4
Medium
If the measure of one angle is 35 degrees, what is the measure of its complementary angle?
A. 55 degrees
B. 45 degrees
C. 75 degrees
D. 90 degrees
Show Answer & Explanation
Correct Answer: A
Complementary angles sum up to 90 degrees. To find the complementary angle, subtract the given angle from 90 degrees.
Q5
Medium
Which pair of angles are complementary?
A. 30 degrees and 60 degrees
B. 45 degrees and 45 degrees
C. 50 degrees and 40 degrees
D. 70 degrees and 20 degrees
Show Answer & Explanation
Correct Answer: C
Complementary angles add up to 90 degrees. 50 + 40 = 90 degrees confirms they are complementary.
Q6
Medium
Which of the following pairs of angles cannot be complementary?
A. 80 degrees and 10 degrees
B. 45 degrees and 45 degrees
C. 70 degrees and 20 degrees
D. 100 degrees and 30 degrees
Show Answer & Explanation
Correct Answer: D
Complementary angles must sum to 90 degrees. 100 + 30 = 130 degrees, which does not satisfy the condition.
Q7
Medium
An angle measures 12 degrees. What is the measure of its complement?
A. 78 degrees
B. 82 degrees
C. 88 degrees
D. 90 degrees
Show Answer & Explanation
Correct Answer: A
The complementary angle is found by subtracting the given angle from 90 degrees: 90 - 12 = 78 degrees.
Q8
Hard
Find the complementary angle of 75 degrees.
A. 15 degrees
B. 10 degrees
C. 25 degrees
D. 30 degrees
Show Answer & Explanation
Correct Answer: A
The complement of 75 degrees is 90 - 75 = 15 degrees.
Q9
Hard
Which of the following pairs is a valid example of complementary angles?
A. 10 degrees and 80 degrees
B. 50 degrees and 40 degrees
C. 30 degrees and 60 degrees
D. 15 degrees and 75 degrees
Show Answer & Explanation
Correct Answer: A
All given angles add up to 90 degrees, thus they are examples of complementary angles.
Q10
Hard
If angle A is 75 degrees and angle B is supplementary to angle A, which equation represents this relationship?
A. A + B = 180
B. A - B = 180
C. A / B = 180
D. A + B < 180
Show Answer & Explanation
Correct Answer: A
Supplementary angles must add to 180 degrees, hence the equation A + B = 180 is correct.

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Lines and Angles — Class 7 Mathematics Practice Questions Online

This page contains 452 practice MCQs for the chapter Lines and Angles in Class 7 Mathematics. The questions are organized by difficulty — 198 easy, 204 medium, 50 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 5 topics, giving you comprehensive coverage of the entire chapter.