Question

find the circumference of the circle whose area is 38.5

Answer 1

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Area of circle = 38.5

⇒ π r² = 38.5

$\sf \frac{22}{7} \: r {}^{2} = 38.5 \\ \\ \sf r {}^{2} = \frac{38.5 \times 7}{22} \\ \\ \sf r {}^{2} = \frac{269.5}{22} \\ \\ \sf r {}^{2} = 12.25 \\ \\ \sf r = \sqrt{12.25} \\ \\ \sf \therefore r = 3.5$

Circumference = 2 π r

⇒ 2 × 22 / 7 × 3.5

⇒ 154 / 7

⇒ 22 cm

Hence, the circumference is 22 cm
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Thanks for the question !

Answer 2

Answer:

6.1

Step-by-step explanation: