Question

find the circumference of circle where radius is 2.8cm​

Answer 1

formula for circumference is 2πr

$= 2\pi \: r \\ = 2 \times \frac{22}{7} \times 2.8 \\= 44 \times 0.4 \\= 17.6cm$

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Answer 2

2pi r

2×22/7×2.8cm

44×0.4cm

17.6cm