6

Lines and Angles

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

Important Questions

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

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1 Verified Answer | Published on 09th 09, 2020

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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

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

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

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

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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


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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

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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:
$$ \angle 4 \quad and \quad \angle 7 $$ 

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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


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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

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Questions 120431
Subjects 10
Chapters 88
Enrolled Students 151
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