What is the length of circumference of a circle with centre O and diameter 9.8 mm?
Answer & explanation
Correct answer: option 2
Concept Used
Circumference = 2 x (\(\frac{22}{7}\)) x r [r = radius of circle]
Calculations
Let radius of circle = r mm
According to the questions,
= 2 x r = 9.8
= r = 4.9
Therefore, circumference = 2 x (\(\frac{22}{7}\)) x 4.9 = 9.8\(\pi \) mm
Therefore, answer is 9.8\(\pi \) mm.