1.

If diameter of a circle is 21 cm, then what will be the circumference of circle?1. 264 cm2. 128 cm3. 66 cm4. 132 cm

Answer» Correct Answer - Option 3 : 66 cm

Concept: Circumference of a circle = 2πr, where 'r' is radius.

Solution: 

Given: Diametre = 21 cm

So, Radius = 21/2

Using above formula, we get, 

2 × 22/7 × 21/2 = 66 cm

Hence, we conclude that the circumference is 66 cm.



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