Class 6 Maths Chapter 2 Lines and Angles Extra Questions

This set of Chapter 2 questions puts lines, rays, and angle classification to the test, going beyond the definitions covered in class to sharpen degree calculations and real-life angle spotting.

Last Updated: September 23, 2026

Very Short Answer Questions

Q1. What is the key difference between a line and a line segment?
Answer: A line segment has two fixed endpoints and a definite length; a line extends endlessly in both directions and has no fixed length.

Q2. How many endpoints does a ray have?
Answer: One — its starting point. It extends without end in only one direction.

Q3. What do you call an angle that measures exactly 90°?
Answer: A right angle.

Q4. What do you call an angle greater than 180° but less than 360°?
Answer: A reflex angle.

Q5. A straight angle equals how many right angles?
Answer: Two right angles (180° = 2 × 90°).

Short Answer Questions

Q6. Classify the following angles as acute, right, obtuse, straight, or reflex: 35°, 90°, 118°, 180°, 260°, 89°.
Answer: 35° = acute; 90° = right; 118° = obtuse; 180° = straight; 260° = reflex; 89° = acute (just under 90°).

Q7. Why can’t an angle be named using only its vertex letter when several angles share that vertex?
Answer: Because it would be unclear which of the several angles sharing that vertex is meant — three letters (with the vertex in the middle) are needed to identify the exact pair of arms forming the angle.

Q8. A ray starts at point M and passes through point N. Can it also be called ray NM? Explain.
Answer: No. In a ray’s name, the first letter is always its starting point. Ray MN starts at M and extends through and beyond N; ray NM would have to start at N and point in the opposite direction, which is a different ray.

Q9. Find the angle between the clock hands at 9 o’clock and at 5 o’clock.
Answer: At 9 o’clock: 9 × 30° = 270°, and the smaller angle is 360° − 270° = 90°. At 5 o’clock: 5 × 30° = 150° (already the smaller angle).

Q10. If a wall clock’s hour hand and minute hand form a straight angle (180°), what time could it be showing (to the nearest hour)?
Answer: 6 o’clock, since 6 × 30° = 180°.

Long Answer / Reasoning Questions

Q11. Take 5 points on a page, no three of which lie on the same line. How many line segments can be drawn joining every pair of points?
Answer: Every pair of the 5 points gives one line segment: C(5,2) = (5 × 4) / 2 = 10 line segments.

Q12. An angle is three times as large as its complement’s “partner” acute angle puzzle: if an acute angle x satisfies that 4x is still acute but 5x is obtuse, list all whole-number degree values x can take, and explain your reasoning step by step.
Answer: We need 4x < 90° (still acute) and 5x > 90° (becomes obtuse). From 4x < 90°: x < 22.5°. From 5x > 90°: x > 18°. So 18° < x < 22.5°, giving whole-number values 19°, 20°, 21°, 22°.

Q13. A circular garden has 12 evenly spaced lamp posts around its boundary (like clock numbers). What is the angle at the centre between two adjacent lamp posts? What is the largest acute angle possible between any two lamp posts as seen from the centre?
Answer: Adjacent angle = 360° ÷ 12 = 30°. Largest acute angle = largest multiple of 30° under 90° = 60° (2 gaps apart); the next multiple, 90°, is a right angle, not acute.

Q14. List three examples of angles you can find in your classroom, and estimate whether each is acute, right, obtuse, or straight.
Answer: Sample answers: the corner of a notebook page (right angle, 90°), an open door held ajar slightly (acute angle), a door opened wide against the wall (obtuse or close to straight angle), the hands of a wall clock at 4 o’clock (obtuse, 120°). (Any three reasonable real-life examples with sensible classification are acceptable.)

Q15. Explain, using the idea of superimposition, how you could check with tracing paper whether two drawn angles are actually equal without measuring them in degrees.
Answer: Trace one angle (its vertex and both arms) onto tracing paper, then place the tracing over the second angle so the vertex and one arm line up exactly. If the second arm of the traced angle also lines up exactly with the second arm of the other angle, the two angles are equal; if it falls short or overshoots, the angles are unequal.

Practice more: Solutions | Revision Notes for this chapter.

Frequently Asked Questions

If two angles on a straight line add up to form the line itself, what is the sum of those two angles called, and what is its value?
These two angles are called a linear pair, and since they together form a straight line, their sum is always exactly 180 degrees.

How would you classify an angle that measures exactly 90 degrees, and what everyday object commonly shows this angle?
An angle that measures exactly 90 degrees is called a right angle, commonly seen at the corner of a square tile or the edge of a book.

Written by Satish

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