LINES AND ANGLES - MCQs

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Maths — LINES AND ANGLES

50 Questions Class 9 MCQs
1
The sum of the angles on a straight line is:
2
Two lines are said to be parallel if:
3
If two lines intersect, then the vertically opposite angles are:
4
The sum of all angles around a point is:
5
If one angle of a linear pair is 50°, the other angle will be:
6
Angles that add up to 90° are called:
7
Angles that add up to 180° are called:
8
Two lines intersect to form one angle of 40°. The other three angles will be:
9
If two lines are perpendicular, each of the angles formed is:
10
When two lines intersect, how many pairs of vertically opposite angles are formed?
11
If one of the angles formed by two intersecting lines is 70°, the measure of its vertically opposite angle is:
12
If two adjacent angles form a straight line, they are called:
13
If a transversal intersects two parallel lines, then alternate interior angles are:
14
Corresponding angles are equal when:
15
If two lines are cut by a transversal and alternate exterior angles are equal, then:
16
If one of the angles of a triangle is a right angle, then the triangle is:
17
The sum of angles of a triangle is:
18
Two angles are supplementary. If one angle is 125°, the other is:
19
Complement of 38° is:
20
Supplement of 77° is:
21
Two complementary angles differ by 30°. The smaller angle is:
22
If two lines are parallel, the sum of interior angles on the same side of transversal is:
23
How many angles are formed when two lines intersect?
24
The angle which is greater than 90° but less than 180° is:
25
Angles less than 90° are called:
26
Angle greater than 180° but less than 360° is:
27
Which of the following is not a type of angle?
28
If one of the linear pair angles is 70°, then the other is:
29
Vertically opposite angles theorem is used in:
30
If two lines are parallel and a transversal cuts them, then alternate interior angles are:
31
In a pair of supplementary angles, if one is 75°, the other is:
32
If two lines are parallel, corresponding angles are:
33
What is the sum of complementary angles?
34
Two adjacent supplementary angles form:
35
If two lines are cut by a transversal, then the number of angles formed is:
36
Which of the following statements is true?
37
The supplement of an obtuse angle is:
38
If two lines are cut by a transversal such that corresponding angles are equal, then the lines are:
39
The bisector of a right angle divides it into:
40
If one angle is 2x and its supplement is 3x, find x.
41
Angles formed on opposite sides of transversal but inside two lines are:
42
The sum of two vertically opposite angles is:
43
The angle between two perpendicular lines is:
44
If two lines are parallel, which one of the following pairs is not equal?
45
An angle that measures exactly 180° is called:
46
The bisectors of two vertically opposite angles are:
47
Which of these pairs cannot form a linear pair?
48
A transversal cuts two parallel lines at distinct points. How many pairs of corresponding angles are formed?
49
Two supplementary angles are in ratio 2:3. The smaller angle is:
50
The complement of an angle is equal to one-fourth of its supplement. Find the angle.
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Frequently Asked Questions

A line is a straight, endless path extending in both directions. It is defined by two points and has only length .

An angle is formed when two rays diverge from a common point called the vertex. Angles are measured in degrees .

A ray starts from one point and extends infinitely in one direction, whereas a line segment connects two points and has a definite length .

Collinear points lie on the same line; non-collinear points do not lie on the same line .

Acute (0°–90°), Right (90°), Obtuse (90°–180°), Straight (180°), Reflex (180°–360°), Complete (360°) .

Complementary angles sum to 90°, supplementary angles sum to 180° .

Adjacent: Share a common arm and vertex; Vertically opposite: Formed when two lines intersect, equal in measure; Linear pair: Two adjacent angles whose non-common arms form a line (sum = 180°) .

The sum of the angles in any triangle is \(180^\circ\) .

The sum of interior angles of an n-sided polygon is \((n-2) \times 180^\circ(n-2)\)

A transversal is a line that intersects two or more lines at distinct points .

Corresponding, Alternate Interior, Alternate Exterior, Co-interior (Consecutive Interior) angles .

Corresponding angles are equal; Alternate interior angles are equal; Co-interior angles are supplementary .

The sum of the angles forming a linear pair is \(180^\circ\)

Vertically opposite angles formed by intersecting lines are equal .

Used in engineering, architectural design, navigation, and geographical surveys .

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