Q1
The diameter of a circle is:
Atwice the radius
Bhalf the radius
Cequal to the radius
Dequal to the circumference
CBSEClass 8 (CBSE)MathematicsCh 11 · Topic 1
Exploring the Circle
Learning key geometric properties and parts of a circle.
Core concept
The value π (pi), approximately 3.14159 or the fraction 22/7, represents the constant ratio of a circle's circumference to its diameter — remarkably, this ratio is exactly the same for every circle, regardless of its size, a discovery that has fascinated mathematicians for thousands of years. Understanding these circle components and formulas is essential for solving real-world problems involving circular objects, from wheel design to architectural domes.
Exam highlight
Key diagram
Keywords worth remembering
Trending
exploring the circlecbse class 8
Most searched
CBSE class 8 exploring the circle
Quick revision
Study resources
Notes & downloads
Quick notes
• Circle parts: centre, radius, diameter (2xradius), chord, arc, and circumference.
• Circumference = 2πr, where π (pi) ≈ 3.14159 or 22/7.
• π represents the constant ratio of circumference to diameter, same for every circle.
• Circle formulas apply to real-world objects like wheels and domes.