Class 9 • Maths • Chapter 6
LINES AND ANGLES
True & False Quiz
Parallel. Transversal. Angles.
✓True
✗False
25
Questions
|
Ch.6
Chapter
|
IX
Class
Why True & False for LINES AND ANGLES?
How this format sharpens your conceptual clarity
🔵 Lines and Angles provide the formal vocabulary of geometry — the angle relationships at parallel lines feed directly into triangle and polygon proofs.
✅ T/F tests complementary/supplementary/vertically opposite angles, and all transversal angle pairs (alternate, co-interior, corresponding).
🎯 Vertically opposite angles are EQUAL (not supplementary) — a very common confusion tested in T/F every year.
📋
Read each statement carefully. Click True or False — instant feedback with explanation appears. Submit anytime; unattempted questions are marked Skipped.
Q 1
Two distinct lines can intersect at more than one point.
Q 2
Vertically opposite angles are always equal.
Q 3
If two angles form a linear pair, their sum is 180°.
Q 4
Corresponding angles are always equal when lines are parallel and cut by a transversal.
Q 5
The sum of measures of angles at a point is always 90°.
Q 6
Alternate interior angles are equal when the lines are parallel.
Q 7
An acute angle can be greater than 90°.
Q 8
A straight angle is 180°.
Q 9
If two angles are supplementary, their sum is 180°.
Q 10
Two obtuse angles can form a linear pair.
Q 11
If two lines are parallel, they never meet.
Q 12
The angle supplementary to 93° is 77°.
Q 13
The complement of an angle x is always greater than x.
Q 14
Two right angles are supplementary.
Q 15
All angles in a linear pair are equal.
Q 16
A transversal can intersect two lines at one point each.
Q 17
If the sum of two angles is 90°, they are called supplementary.
Q 18
Vertical angles appear only when lines are parallel.
Q 19
If two lines are cut by a transversal and alternate exterior angles are equal, lines are parallel.
Q 20
When two lines intersect, four angles are formed.
Q 21
An angle which is half of a straight angle is a right angle.
Q 22
Adjacent angles never have a common arm.
Q 23
If a transversal intersects two lines so that a pair of corresponding angles is equal, then the lines are parallel.
Q 24
The sum of all the angles at a point is 360°.
Q 25
If two lines are not parallel, no pairs of alternate angles will ever be equal.
Key Takeaways — LINES AND ANGLES
Core facts for CBSE Boards & exams
1
Complementary angles sum to 90°; Supplementary angles sum to 180°.
2
Vertically opposite angles are EQUAL — formed at the intersection of two lines.
3
Linear pair: two adjacent angles on a straight line summing to 180°.
4
Parallel lines cut by a transversal: Corresponding = equal; Alternate interior = equal; Co-interior (same-side) = supplementary.
5
Sum of angles on a straight line = 180° (linear pair axiom).
6
Sum of all angles around a point = 360°.