Q1
The area of a circle is calculated using:
Aπr²
B2πr
Cπd
D2πd
CBSEClass 8 (CBSE)MathematicsCh 14 · Topic 2
Area of a Circle
Learning the formula for calculating the area enclosed by a circle.
Core concept
For example, a circle with radius 7cm has an area of (22/7) × 7 × 7 = 154 cm². This formula has countless practical applications, from calculating the amount of material needed for a circular tablecloth or pizza, to determining the cross-sectional area of a circular pipe, making it one of the most frequently used geometric formulas in everyday life and various professions like engineering and design.
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• Area of a circle: A = πr² (pi times radius squared).
• Doubling a circle's radius makes its area 4 times larger, not 2 times.
• Example: radius 7cm gives area (22/7)x7x7 = 154 cm².
• Practical applications: tablecloths, pizzas, pipe cross-sections, engineering design.