CBSE Board Practice

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CBSE Grade IX - Lines and Angles

Question 1

1.	Find the value of 'u' in the following figure
	43° 53° 38° 48° 68°

Question 2

2.	Multiple lines drawn on a plane are called
	parallel lines coplanar lines intersecting lines concurrent lines perpendicular lines

Question 3

3.	In the following figure, one side of a triangle has been produced. Find all the angles of the triangle.
	I = 58° , J = 47° , K = 75° I = 60° , J = 43° , K = 77° I = 60° , J = 45° , K = 75° I = 62° , J = 45° , K = 73° I = 58° , J = 45° , K = 77°

Question 4

4.	In the given figure, calculate the value of x.
	x = 21° x = 24° x = 20° x = 23° x = 22°

Question 5

5.	Which of the following are true?
	a) If   e ∥ f   and   f ∥ g   , then   e ∥ g b) If two lines are parallel to the same line, then they are parallel to each other c) If two lines are parallel to the same line, then they are perpendicular to each other d) If   e ⟂ f   and   f ⟂ g   , then   e ⟂ g e) If   e ⟂ f   and   e ⟂ g   , then   f ⟂ g
	{d,b,a} {a,b} {c,a} {d,b} {e,c,a}

Question 6

6.	One of the two equal angles of an isosceles triangle measures 66°. Find the measure of each angle of the triangle.
	A = 64° , B = 68° , C = 48° A = 68° , B = 66° , C = 46° A = 64° , B = 66° , C = 50° A = 66° , B = 66° , C = 48° A = 66° , B = 64° , C = 50°

Question 7

7.	Find the interior alternate angles in the given figure
	∠1 , ∠4 ; ∠2 , ∠3 ; ∠5 , ∠8 ; ∠6 , ∠7 ∠1 , ∠2 ; ∠2 , ∠4 ; ∠4 , ∠3 ; ∠3 , ∠1 ; ∠5 , ∠6 ; ∠6 , ∠8 ; ∠8 , ∠7 ; ∠7 , ∠5 ∠3 , ∠4 , ∠5 , ∠6 ∠1 , ∠8 ; ∠2 , ∠7 ∠3 , ∠6 ; ∠4 , ∠5

Question 8

8.	Calculate the value of the lettered angle in the following figure
	x = 55.04° x = 56.04° x = 54.04° x = 57.04° x = 53.04°

Question 9

9.	Which of the given figures is correct?
	IV II III I

Question 10

10.	Which of the following is a reflex angle?
	111° 90° 71° 0° 339°

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