Question

Find the circumference of a circle whose diameter is 4.2 cm​

Answer 1

Answer:

13.2 cm

Step-by-step explanation:

$d = 4.2cm \\ r = \frac{d}{2} = \frac{4.2}{2} = 2.1 \\ \\ circumference = 2\pi \: r \\ = 2 \times \frac{22}{7} \times 2.1 \\ = 2 \times 22 \times 0.3 \\ = 44 \times 0.3 \\ = 13.2cm$

Answer 2

Answer:

the circumference of circle is 13.2 cm

Step-by-step explanation:

Given: Diameter= 4.2

Radius= 4.2/2= 2.1 cm

Circumference of a circle = 2πr

= 2×22/7×2.1

= 44/7×2.1

= 44×0.3

= 13.2

Therefore, the circumference of circle is 13.2 cm

correct explanation

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