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# Lines and Angles

9th Class - CBSE - Mathematics - 1612 Questions - 5 Concepts

## All Concepts

#### Important Questions

Q1 Single Correct Medium
What is the value of $a-b$
• A. $180^0$
• B. $60^0$
• C. $70^0$
• D. $120^0$

Asked in: Mathematics - Lines and Angles

1 Verified Answer | Published on 09th 09, 2020

Q2 Single Correct Medium
As shown in above figure which of the following angles are equal
• A. $\angle1$ and $\angle2$
• B. $\angle1$ and $\angle3$
• C. $\angle1$ and $\angle4$
• D. None of the above

Asked in: Mathematics - Lines and Angles

1 Verified Answer | Published on 09th 09, 2020

Q3 TRUE/FALSE Medium
Pair of vertically opposite angles are always supplementary
• A. True
• B. False

Asked in: Mathematics - Lines and Angles

1 Verified Answer | Published on 09th 09, 2020

Q4 TRUE/FALSE Medium
Vertically opposite angles are both same type of angles.(either acute, obtuse or right angles.)
• A. True
• B. False

Asked in: Mathematics - Lines and Angles

1 Verified Answer | Published on 09th 09, 2020

Q5 Single Correct Medium
Vertically opposite angles are always
• A. supplementary
• B. complementary
• D. equal

Asked in: Mathematics - Lines and Angles

1 Verified Answer | Published on 09th 09, 2020

Q6 Single Correct Medium
In the given figure, two straight lines $AB$ and $CD$ intersect at a point $O$ and $\angle AOC$ = $50^{o}$. Then $\angle BOD$ = ?
• A. $40^{o}$
• B. $50^{o}$
• C. $130^{o}$
• D. $60^{o}$

Asked in: Mathematics - Lines and Angles

1 Verified Answer | Published on 09th 09, 2020

Q7 Assertion & Reason Medium
##### ASSERTION

If two lines intersect, then the vertically opposite angles are equal.

##### REASON

If a transversal intersects, two other parallel lines, then the sum of two interior angles on the same side of the transversal is $180^o$.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Asked in: Mathematics - Lines and Angles

1 Verified Answer | Published on 09th 09, 2020

Q8 Subjective Medium
In questions $1$ and $2,$ given below, identify the given pairs of angles as corresponding angles, interior alternate angles, exterior alternate angles, adjacent angles, vertically opposite angles or allied angles:
$\angle 4 \quad and \quad \angle 7$

Asked in: Mathematics - Lines and Angles

1 Verified Answer | Published on 09th 09, 2020

Q9 Single Correct Medium
In figure, lines $l$ and $m$ intersect each other at a point. Which of the following is false?
• A. $\angle a= \angle b$
• B. $\angle d =\angle c$
• C. $\angle a+ \angle d=180^o$
• D. $\angle a=\angle d$

Asked in: Mathematics - Lines and Angles

1 Verified Answer | Published on 09th 09, 2020

Q10 Multiple Correct Medium
If $\angle 2=(3x-10)^o$ and $\angle 8=(5x-30)^o$, find the measures of $\angle 2$ and $\angle 8$.
• A. $\angle 2=20^o$
• B. $\angle 8=20^o$
• C. $\angle 2=40^o$
• D. $\angle 8=40^o$

Asked in: Mathematics - Lines and Angles

1 Verified Answer | Published on 09th 09, 2020

Questions 120431
Subjects 10
Chapters 88
Enrolled Students 151