CBSE Questions for Class 9 Maths Lines And Angles Quiz 6 - MCQExams.com

Find the complement of the following angles:
$$63^{\circ}$$.
  • $$27^{\circ}$$
  • $$54^{\circ}$$
  • $$117^{\circ}$$
  • None of these
$$\angle PQR$$ and $$\angle QOR$$ form a linear pair. If $$a-b=80$$, find the values of a and b

243468_b561c3f181044470a294940231bff071.png
  • $$a=130^o$$
  • $$a=80^o$$
  • $$b=50^o$$
  • $$b=130^o$$
State True or False.
In figure, $$\angle PQR=\angle PRQ$$, then $$\angle PQS=\angle PRT$$.

243967_2b048aa1c3484d05a74e2f933859083a.png
  • True
  • False
If one angle of a triangle is equal to the sum of the other two angles, then the triangle is:
  • Obtuse angle triangle 
  • Acute angle triangle 
  • Right angle triangle 
  • None of these 
If the angles of a triangle are in the ratio $$2:3:4$$, find the three angles.
  • $$80^o, 120^o, 160^o$$
  • $$20^o, 30^o, 40^o$$
  • $$40^o, 60^o, 80^o$$
  • None of these
In fig, then $$\angle A+\angle B+\angle C+\angle D+\angle E+\angle F=$$

243960_f7d17ff8ff3445f8b1c7f338ed80d84c.png
  • $$180^o$$
  • $$270^o$$
  • $$360^o$$
  • $$540^o$$
In the given figure, value of $$x$$ is .........
313985.png
  • 45$$^o$$
  • 34$$^o$$
  • 64$$^o$$
  • 109$$^o$$
The measure of angle $$y$$ in the given figure is ......... .
272135_1f05d59139764926bd7a0eed2951f541.png
  • $$\angle y = 65^{\circ}$$
  • $$\angle y = 85^{\circ}$$
  • $$\angle y = 75^{\circ}$$
  • $$\angle y = 80^{\circ}$$
The measure of an angle is three times the measure of its complement. The angles are:
  • $$20^\circ,\, 60^\circ$$
  • $$30^\circ,\, 60^\circ$$
  • $$45^\circ,\, 135^\circ$$
  • $$22.5^\circ,\, 67.5^\circ$$
If two angles of a triangle are acute angles, then the third angle:
  • is less than the sum of the two angles
  • should be an acute angle
  • is the largest angle of the triangle
  • is an angle with any measurement less than $$180^o$$
When the clock shows time $$5:20$$, the angle formed between the two hands is
  • obtuse
  • right
  • acute
  • none of these
Supplementary angle of $$108.5^{\circ}$$ is
  • $$70.5^{\circ}$$
  • $$71.5^{\circ}$$
  • $$71^{\circ}$$
  • $$72.5^{\circ}$$
Complementary angle of $$72\displaystyle \frac{1}{2}^{\circ}$$ is:
  • $$17^{\circ}$$
  • $$18\displaystyle \frac{1}{2}^{\circ}$$
  • $$21\displaystyle \frac{1}{2}^{\circ}$$
  • $$17\displaystyle \frac{1}{2}^{\circ}$$
All linear pairs are
  • supplementary
  • vertically opposite
  • right angles
  • none of these
$$\angle AEC$$ and $$\angle CED$$ are supplementary angles. If $$\angle CED$$ is equal to $$62^{\circ}$$ ,what is the measure of $$\angle AEC$$?
312859.png
  • $$28^{\circ}$$
  • $$150^{\circ}$$
  • $$118^{\circ}$$
  • $$124^{\circ}$$
 In given figure which one of the following angle is a straight angle 
456931_ff996a3c3e8144c4a2d3799df341228b.png
  • $$\angle AOB$$
  • $$\angle AOD$$
  • $$\angle BOC$$
  • $$\angle BOD$$
Find the value of $$x$$ and $$y$$.
456935_bba77c97bf644ca3a7ba2745efdad608.png
  • $$60^{\circ}, 45^{\circ}$$
  • $$45^{\circ}, 60^{\circ}$$
  • $$45^{\circ}, 45^{\circ}$$
  • $$60^{\circ}, 60^{\circ}$$
A reflex angle is .........a straight angle.
  • Smaller than
  • Larger than
  • Equal to
  • One-half of
Which of the following is an obtuse angle ?
  • $$92^\circ$$
  • $$181^\circ$$
  • $$195^\circ$$
  • $$83^\circ$$
The sum of two acute angles can be:
  • Acute angles
  • Obtuse angles
  • Right angles
  • All of the above
Find the complements of $$\displaystyle { 68 }^{ o }$$ and $$\displaystyle { 33 }^{ o }$$ respectively.
  • $$22^o, 57^o$$
  • $$57^o, 22^o$$
  • $$33^o, 67^o$$
  • $$67^o, 33^o$$
Which of the following indicated figures are examples of adjacent angles.
443818_f0d4262453bb496e9fc5cb49b0e18639.png
  • (i) and (iv)
  • (i) and (ii)
  • (i) and (iii)
  • (ii) and (iv)
In $$\Delta ABC,$$ $$\angle A = 43^{o}$$ and $$\angle C = 70^{o}.$$ What is the measure of $$\angle B?$$
  • $$63^{o}$$
  • $$65^{o}$$
  • $$66^{o}$$
  • $$67^{o}$$
The angles of a triangle are in the ratio of $$2:3:4.$$ What is the measure of the smallest interior angle of the triangle?
  • $$10^{o}$$
  • $$20^{o}$$
  • $$30^{o}$$
  • $$40^{o}$$
Find the measure of an exterior angle at the base of an isosceles triangle whose vertex angle measures $$50^o$$.

458475_a3eac5f5ba924ea68cabaf710c2786fa.png
  • $$100^o$$
  • $$110^o$$
  • $$115^o$$
  • $$65^o$$
In $$\Delta PQR, \angle Q = 23^{o}$$ and $$\angle R = 20^{o}.$$ What is the measure of $$\angle P?$$
  • $$134^{o}$$
  • $$135^{o}$$
  • $$136^{o}$$
  • $$137^{o}$$
If m$$\angle$$ $$PRQ = 45^o$$ and m$$\angle$$ $$QPR = 68^o$$. What is m$$\angle$$ $$PQR$$ in the triangle?
  • $$67^o$$ 
  • $$68^o$$
  • $$69^o$$ 
  • $$70^o$$
In $$\Delta ABC, \angle A = 56^{o}$$ and $$\angle B = 60^{o}.$$ What is the measure of $$\angle C?$$
  • $$64^{o}$$
  • $$65^{o}$$
  • $$66^{o}$$
  • $$67^{o}$$
The angles of a triangle are in the ratio of $$3:5:7.$$ What is the measure of the largest interior angle of the triangle?
  • $$18^{o}$$
  • $$48^{o}$$
  • $$84^{o}$$
  • $$96^{o}$$
In $$\triangle ABC$$, if $$\angle B = \angle C = 45^{\circ}$$, which of the following is correct?
  • $$\angle A= 60°$$
  • $$\angle A= 70°$$
  • $$\angle A= 80°$$
  • $$\angle A= 90°$$
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