Multiple choice

If the area of a circle is $346.5 \displaystyle cm^{2}$. Its circumference is

  1. $11 cm$
  2. $66 cm$
  3. $22 cm$
  4. $44 cm$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Area = pi * r^2 = 346.5. r^2 = 346.5 / (22/7) = 110.25. r = 10.5. Circumference = 2 * pi * r = 2 * (22/7) * 10.5 = 66 cm.

AI explanation

Using the circle area formula, 346.5 equals 22 over 7 times the radius squared. Solving this gives a radius squared of 110.25, making the radius 10.5 cm. The circumference formula gives 2 times 22 over 7 times 10.5, which results in 66 cm.

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