CBSE Class 9 Mathematics Worksheet
Unit 4-Geometry - Lines and angles
1.
In the given figure if 
and 
are in the ratio 2:3. Find .
A)
36°
B)
72°
C)
144°
D)
108°
2.
In the given figure find the sum of 
.
A)
360°
B)
180°
C)
90°
D)
540°
3.
In the figure, find the value of x?
A)
120°
B)
130°
C)
145°
D)
75°
4.
In the given figure if y = 40°, find x.
A)
35°
B)
140°
C)
40°
D)
70°
5.
Find the measure of an angle, if seven times its complement is 10 less than three times its supplement.
A)
60°
B)
30°
C)
150°
D)
10°
6.
State True/False: The sum of the angles of a triangle is 360°.
A)
true
B)
false
7.
Fill in the blanks: If the sides of a triangle are produced in order, prove that the sum of the exterior angles so formed is equal to ______.
A)
90°
B)
360°
C)
180°
D)
540°
8.
Fill in the blanks: If one angle of a triangle is equal to the sum of the other two angles, then the triangle is _______.
A)
an isosceles triangle
B)
an obtuse triangle
C)
a right triangle
D)
an equilateral triangle
9.
Fill in the blanks: An exterior angle of a triangle is 120° and its two interior opposite angles are equal. Each of these equal angles is _______.
A)
60°
B)
30°
C)
120°
D)
None of these
10.
In the given figure AB||CD. If a = 40°, find b?
A)
35°
B)
140°
C)
40°
D)
50°
11.
In the given figure, if AB || DE, ∠ BAC = 35° and ∠ CDE = 53°, find ∠ DCE?
A)
92°
B)
72°
C)
145°
D)
60°
12.
A)
75
B)
285
C)
200
D)
135
14.
In the given figure if a – b = 120°, where AOB is a line, find a?
A)
150°
B)
120°
C)
60°
D)
30°
15.
In the given figure if 
, find where AOB is a line.
A)
120°
B)
130°
C)
60°
D)
30°
16.
In the figure if AB || CD, CD || EF and y : z = 2 : 3, find x?
A)
36°
B)
72°
C)
108°
D)
60°
17.
A)
115
B)
110
C)
45
D)
55
18.
Two angles of a triangle are equal and the third angle is greater than each one of them by 18 . Find the greatest angle.
A)
72°
B)
54°
C)
90°
D)
None of these
19.
Fill in the blanks: If one of the angles of a triangle is 130°, then the angle between the bisectors of the other two angles can be ________.
A)
60°
B)
30°
C)
150°
D)
100°
20.
The angles of triangle are (x + 10°), (2x – 30°) and x°. Find the value of x.
A)
30°
B)
50°
C)
60°
D)
40°
CBSE Class 9 Mathematics Worksheet
Unit 4-Geometry - Lines and angles
Answers
1.
Option B
2.
Option A
3.
Option B
4.
Option D
5.
Option D
6.
Option B
7.
Option B
8.
Option C
9.
Option B
10.
Option C
11.
Option A
12.
Option B
13.
Option A
14.
Option A
15.
Option C
16.
Option C
17.
Option C
18.
Option A
19.
Option C
20.
Option B
