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Gyaan Maths
CBSE · Class 6-10
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CBSE Maths · Class 6

Chapter 4: Basic Geometrical Ideas

Name: ________________________
Date: ______________
Marks: ____ / 10

Points, lines, line segments, rays, angles, triangles, polygons and circles.

Questions

  1. Number of diagonals in a pentagon.
  2. Is angle 0∘0^\circ obtuse?
  3. Draw a chord and a diameter in a circle. Which is longer?
  4. How many endpoints does a line segment have?
  5. What is the measure of a straight angle?
  6. Diameter of a circle with radius 77 cm.
  7. A ray has how many endpoints?
  8. Sum of angles of a triangle.
  9. Number of sides in a pentagon.
  10. Which is longer: a diameter or a radius of the same circle?

Extra Practice (Optional)

  • Give three real-life examples of parallel lines.
  • How many sides does a nonagon have?
  • Draw an angle of 60∘60^\circ with a protractor.

Answer Key (For Teachers)

  1. Answer: 55.
    Working: 5⋅22\dfrac{5 \cdot 2}{2}.
  2. Answer: No.
    Working: Obtuse is between 90∘90^\circ and 180∘180^\circ.
  3. Answer: Diameter is longest chord.
    Working: Diameter passes through centre; chord doesn't necessarily.
  4. Answer: 22
    Working: Two.
  5. Answer: 180∘180^\circ
    Working: Half a full turn.
  6. Answer: 1414 cm
    Working: 2r2r.
  7. Answer: 11
    Working: Starts at one, extends without end.
  8. Answer: 180∘180^\circ
    Working: Property.
  9. Answer: 55
    Working: 'Penta' means 55.
  10. Answer: Diameter.
    Working: Diameter =2⋅= 2\cdot radius.
Gyaan Maths · CBSE Class 6 · Chapter 4
Gyaan Maths — CBSE Class 6-10, built for board-toppers.
v1.1 · Feb 2026