[ CBSE CLASS 6 / COMPUTATIONAL THINKING / CHAPTER 2 / 2026-27 ]

Class 6 Lines and Angles: Computational Thinking Questions and Answers

The Lines and Angles CT chapter uses points, rays and turns to build step-by-step reasoning. Students count segments and angles systematically and follow turn instructions like a robot, which is algorithmic thinking.

Practise 6 questions Printable worksheet
Skills: Algorithmic thinking · Pattern recognition · Decomposition · Linked to Ganita Prakash Chapter 2: Lines and Angles

[ WORKED EXAMPLE ]

Four points are marked, with no three on one line. How many line segments join them in pairs?

Answer: 6.

  1. A joins B, C and D: 3 segments.
  2. B joins C and D: 2 new segments. C joins D: 1 new segment.
  3. 3 + 2 + 1 = 6 segments.

What this chapter is about

Students work with points, line segments, rays and angles, and classify angles as acute, right, obtuse, straight or reflex.

Counting problems (how many segments join 4 points?) reward a system: list from each point in turn so nothing is missed or counted twice.

Turn instructions such as “face north, turn right 90°” are small algorithms. Students run them in their heads and check the final direction.

[ PRACTICE MODE / 6 QUESTIONS ]

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Pattern recognitionQuestion 1 of 6 · Score 0

Four points are marked, with no three on one line. How many line segments join them in pairs?

Choose one answer

All Lines and Angles questions with answers

Try each one first, then open it to check the answer and the reasoning.

Q1Four points are marked, with no three on one line. How many line segments join them in pairs?
  • 4
  • 6
  • 8
  • 12

Answer: B. 6

Hint: Join point A to the others first, then point B to the ones not yet joined.

  1. A joins B, C and D: 3 segments.
  2. B joins C and D: 2 new segments. C joins D: 1 new segment.
  3. 3 + 2 + 1 = 6 segments.

Skill: Pattern recognition · Level: medium · Report an error

Q2The minute hand moves from 12 to 4. Through what angle has it turned?
  • 90°
  • 100°
  • 120°
  • 140°

Answer: C. 120°

Hint: A full turn is 360° and the clock face has 12 equal parts.

  1. Each number on the clock is 360° ÷ 12 = 30° apart.
  2. From 12 to 4 is 4 steps.
  3. 4 × 30° = 120°.

Skill: Abstraction · Level: easy · Report an error

Q3What type of angle measures 135°?
  • Acute
  • Right
  • Obtuse
  • Reflex

Answer: C. Obtuse

Hint: Compare 135° with 90° and 180°.

  1. Acute is less than 90°; right is exactly 90°.
  2. Obtuse is between 90° and 180°.
  3. 135° is between 90° and 180°, so it is obtuse.

Skill: Abstraction · Level: easy · Report an error

Q4A robot faces North. It turns right 90°, then right 90°, then left 90°. Which way does it face now?
  • North
  • East
  • South
  • West

Answer: B. East

Hint: Run each instruction one at a time and write the direction after each.

  1. Start: North. Right 90° → East.
  2. Right 90° → South.
  3. Left 90° → East.

Skill: Algorithmic thinking · Level: medium · Report an error

Q5Three rays OA, OB and OC start at point O, with OB between OA and OC. How many angles can be named at O?
  • 2
  • 3
  • 4
  • 6

Answer: B. 3

Hint: Count the small angles, then the angle made by joining them.

  1. Small angles: ∠AOB and ∠BOC.
  2. Together they make ∠AOC.
  3. That is 3 angles in total.

Skill: Decomposition · Level: medium · Report an error

Q6A robot starts facing East and repeats “turn left 90°” 7 times. Which way does it face?
  • North
  • West
  • South
  • East

Answer: C. South

Hint: Four left turns bring it back to where it started.

  1. 4 turns of 90° make a full 360° turn, so the robot faces East again.
  2. 7 = 4 + 3, so only the last 3 turns matter.
  3. East → North → West → South.

Skill: Algorithmic thinking · Level: challenge · Report an error

Frequently asked questions

What does the Class 6 Lines and Angles Computational Thinking chapter cover?

The Lines and Angles CT chapter uses points, rays and turns to build step-by-step reasoning. Students count segments and angles systematically and follow turn instructions like a robot, which is algorithmic thinking.

Which computational thinking skills does Lines and Angles use?

Lines and Angles mainly practises algorithmic thinking, pattern recognition, decomposition. It links to Ganita Prakash Chapter 2: Lines and Angles.

Where are the official CBSE Lines and Angles questions?

The official questions are in the CBSE Class 6 Computational Thinking and AI handbook for 2026-27, free on the CBSE Academic website. The practice on this page is original and mapped to the same chapter.

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